Alternator bad? Voltage regulator maybe?

"johninKY" wrote in
<news:39d8253a719967c941ed1a29e8f62d5d@localhost.talkaboutautos.com>:

> This alternator has an IR.

Sorry, but my primary career has been in computers. IR, to me, means
InfraRed, as in the light spectrum used by communication
transmitters/receivers. Maybe IR means Internal Regulator?

I just looked again at the alternator in my car and see nothing that is
accessible from the outside to let me swap out a regulator module. I
couldn't even find a tag that listed the amp rating. Any idea how many
amps the replacement alternator should supply? I think it is 70 or
maybe 80 amps. This car does have air conditioning (the compressor is
still in place but the system sprung a leak after a recharge and hasn't
worked in over 10 years - I'd like to remove the compressor to remove
any drag, if there was any since it is never turned on, but don't see
how to put a pulley there for the belt). Of the few places that
mentioned a rating, I usually see 70A units although 50A and 90A were
also mentioned.

> Problem probably is the alternator has lost a
> diode. Not worth tinkering with if you haven't rebuilt a few. You can
> use a much newer alternator if willing to change the wiring plug.
> Thinking 1994 was the year the plug changed.

Never rebuilt an alternator. My guess, based on the assumption that bad
luck is likely, is that I would open it up and find I had to dismantle
everything to get at a module that is riveted behind everything else. I
found a diagram of the alternator at http://tinyurl.com/6rx7so. Yep,
the voltage regulator is inside (on item #2). Looks like it might be
possible to open it up to replace just the "plate" holding the
regulator; however, the prices that I've seen for the regulator alone
are higher than the entire rebuilt alternator.

Splicing in a new plug wouldn't be a problem for me. I'm very handy
with soldering and heatshrink tubing to make a solid inline splice. The
problem would be getting the plug. I don't know that a new alternator
would include a matching plug. The rebuild that I bought last time
didn't include one. If I don't get one spec'ed for my car, I'm also
guessing the mounting plates and holes won't line up.

After checking some other maintenance receipts to figure out what the
mileage might've been at the time I replaced the alternator, the 2nd
alternator now in the car (which was the rebuilt replacement from the
salvage shop with 1-year warranty) only lasted maybe all of 20K miles
which seems damn short. The 72-month battery is only 16 months old. Is
it possible a weak or defective battery would result in the voltage
readings that I saw (12.5V across the battery terminals with the car
running)? It'd be easier to dump in a new battery than take off the fan
belts to remove the alternator and have to do it in reverse again. Even
if the battery were defective, I still expected the voltage to rise when
I revved the engine. Apparently to have the alternator tested at the
parts store means having to remove it from the car; i.e., they can't
test it /in situ/.

I have the following choices (for cheapest prices found so far), all of
which are rebuilds:

- ProStart brand: $118.99 (PepBoys; also at Advance Auto but I can't get
a price online and too late to call right now).
- Autolite (Pro-Tech) brand: $129.99 (Advance Auto or Checker Auto Parts
since both use PartsAmerica.com).
- O'Reilly Auto Parts (no brand identified other than "Ultima"): $119.

All have lifetime warranties. The Autolite unit includes a roadside
assistance perk (with a $60 max reimbursement). They didn't mention the
amperage rating so I'll have to check that tomorrow. Any experience in
which brand or store you like best for an alternator?
 >> Stay informed about: Alternator bad? Voltage regulator maybe? 

The only difficult part opening up an alternator is removing the pulley.
Only thing I found that always works is an impact gun. Once the pulley is
off just remove those long bolts running through the case and everything
falls apart. Just mentioning this if you decide to open it to inspect the
insides. When a diode fails the battery "back drains" through the
alternator which I think is your problem. Or at least part of the
problem. There are companies out there that sell new connectors but the
easy way to get the newer connector is to just cut one from a newer
wrecking yard car. You don't have a 90A alternator now. Use to know the
amperage output but now guessing in the 75A range. I have never had good
results with using rebuilds, or at least the kind sold at auto parts
stores. Quality over the years has been very poor.

--
Message posted using http://www.talkaboutautos.com/group/alt.autos.subaru/
More information at http://www.talkaboutautos.com/faq.html
 >> Stay informed about: Alternator bad? Voltage regulator maybe? 

May want to read this. Mitsubishi, not a Subaru, but essentially the same
design.

http://www.stealth316.com/2-alt-rebuild.htm

--
Message posted using http://www.talkaboutautos.com/group/alt.autos.subaru/
More information at http://www.talkaboutautos.com/faq.html
 >> Stay informed about: Alternator bad? Voltage regulator maybe? 

VanguardLH wrote:
> Car wouldn't start (an old '92 Subaru Legacy L wagon). Battery is about
> 3 years old and the car started a week ago. However, today it just
> cranked like one turn and died. I can hear the relay click as I turn
> the key but the engine doesn't budge. I also noticed the electric seat
> belt moved slowly.
>
> I popped the hood, jumped started from my other car, and with a
> voltmeter measured across the battery. It measured 12.5V. As I recall,
> each cell in a new battery should be 2.2 volts and there are 6 cells so
> a new battery should measure 13.2 volts, so 12.5V isn't bad for a
> middle-aged battery. However, I expected the voltage to be higher while
> the car was running due to the output from the alternator. The voltage
> also did not fluctuate when I revved the engine. It dropped a volt when
> I turned on the headlights. So it looks like the alternator is bad.
> While 16 years old, mileage is only 135K so, on average, the 2
> alternators have lasted only about 67K which seems a bit short-lived
> (actually the first one probably lasted 105K and the 2nd died after
> another 30K).
>
> I had to replace this alternator about 4 years ago. The prior run
> burned up. Its bearing went bad and it heated up so you could smell the
> varnish on the windings within a few blocks of driving from cold. It
> was a rebuilt and is now out of warranty. I got it for around $80. The
> salvage place doesn't have another alternator (except for a
> retail-priced new one). I can get one for $118 at PepBoys with a
> lifetime warranty; however, I'm wondering if just the voltage regulator
> is shot. I can't see what the module is on the outside so maybe the
> regulator is inside. If inside, I'm not dismantling it to replace that
> module. I suspect if it is inside that it'll be riveted and positioned
> where it won't be easy to get out to replace it, assuming that just the
> regulator can be purchased and is much cheaper. If the voltage doesn't
> get above what the battery alone will provide, is it even a voltage
> regulator problem?
>
> I can't find my battery charger so I'll call a buddy to drop by with
> his. I need to charge the battery so I can get to PepBoys to have them
> do an alternator test and have enough juice in the battery to start it
> again to get the old Subie back home.
>
>
> What should be the voltage across the battery while the car is running
> and with a working alternator? I thought it was 14.4V. It would have
> to be higher than the 13.2V for a new battery.
>
> Is the voltage regulator inside or outside?
>
> How trustworthy are these parts shop alternator testers?
>
> Suggestions on how to go cheap on the alternator replacement? The
> 1-year salvaged rebuilt alternator lasted 4 years. Considering it was a
> third the price, another 4 years is just fine with me.
Hi,
Sounds like your battery is drained by some unknown load or it is bad.
Probably one cell gone bad. If you can't test battery, try another one
then yo can decide. When charging the voltage should be ~14V. Is the
battery warm to touch?
 >> Stay informed about: Alternator bad? Voltage regulator maybe? 

VanguardLH wrote:
> "johninKY" wrote in
> <news:39d8253a719967c941ed1a29e8f62d5d@localhost.talkaboutautos.com>:
>
>> This alternator has an IR.
>
> Sorry, but my primary career has been in computers. IR, to me, means
> InfraRed, as in the light spectrum used by communication
> transmitters/receivers. Maybe IR means Internal Regulator?
>
> I just looked again at the alternator in my car and see nothing that is
> accessible from the outside to let me swap out a regulator module. I
> couldn't even find a tag that listed the amp rating. Any idea how many
> amps the replacement alternator should supply? I think it is 70 or
> maybe 80 amps. This car does have air conditioning (the compressor is
> still in place but the system sprung a leak after a recharge and hasn't
> worked in over 10 years - I'd like to remove the compressor to remove
> any drag, if there was any since it is never turned on, but don't see
> how to put a pulley there for the belt). Of the few places that
> mentioned a rating, I usually see 70A units although 50A and 90A were
> also mentioned.
>
>> Problem probably is the alternator has lost a
>> diode. Not worth tinkering with if you haven't rebuilt a few. You can
>> use a much newer alternator if willing to change the wiring plug.
>> Thinking 1994 was the year the plug changed.
>
> Never rebuilt an alternator. My guess, based on the assumption that bad
> luck is likely, is that I would open it up and find I had to dismantle
> everything to get at a module that is riveted behind everything else. I
> found a diagram of the alternator at http://tinyurl.com/6rx7so. Yep,
> the voltage regulator is inside (on item #2). Looks like it might be
> possible to open it up to replace just the "plate" holding the
> regulator; however, the prices that I've seen for the regulator alone
> are higher than the entire rebuilt alternator.
>
> Splicing in a new plug wouldn't be a problem for me. I'm very handy
> with soldering and heatshrink tubing to make a solid inline splice. The
> problem would be getting the plug. I don't know that a new alternator
> would include a matching plug. The rebuild that I bought last time
> didn't include one. If I don't get one spec'ed for my car, I'm also
> guessing the mounting plates and holes won't line up.
>
> After checking some other maintenance receipts to figure out what the
> mileage might've been at the time I replaced the alternator, the 2nd
> alternator now in the car (which was the rebuilt replacement from the
> salvage shop with 1-year warranty) only lasted maybe all of 20K miles
> which seems damn short. The 72-month battery is only 16 months old. Is
> it possible a weak or defective battery would result in the voltage
> readings that I saw (12.5V across the battery terminals with the car
> running)? It'd be easier to dump in a new battery than take off the fan
> belts to remove the alternator and have to do it in reverse again. Even
> if the battery were defective, I still expected the voltage to rise when
> I revved the engine. Apparently to have the alternator tested at the
> parts store means having to remove it from the car; i.e., they can't
> test it /in situ/.
>
> I have the following choices (for cheapest prices found so far), all of
> which are rebuilds:
>
> - ProStart brand: $118.99 (PepBoys; also at Advance Auto but I can't get
> a price online and too late to call right now).
> - Autolite (Pro-Tech) brand: $129.99 (Advance Auto or Checker Auto Parts
> since both use PartsAmerica.com).
> - O'Reilly Auto Parts (no brand identified other than "Ultima"): $119.
>
> All have lifetime warranties. The Autolite unit includes a roadside
> assistance perk (with a $60 max reimbursement). They didn't mention the
> amperage rating so I'll have to check that tomorrow. Any experience in
> which brand or store you like best for an alternator?
Hi,
I'd rather think I in this case stand for integrated or imbedded.
If alternator is really proven bad, it can be rebuilt if you want to.
Or hen you bring bad one it's worh a few bucks in exhcange.
 >> Stay informed about: Alternator bad? Voltage regulator maybe? 

"johninKY" wrote in
<news:020b13254bbe658cc026c68d41868efe@localhost.talkaboutautos.com>:

> The only difficult part opening up an alternator is removing the pulley.
> Only thing I found that always works is an impact gun. Once the pulley is
> off just remove those long bolts running through the case and everything
> falls apart. Just mentioning this if you decide to open it to inspect the
> insides. When a diode fails the battery "back drains" through the
> alternator which I think is your problem. Or at least part of the
> problem. There are companies out there that sell new connectors but the
> easy way to get the newer connector is to just cut one from a newer
> wrecking yard car. You don't have a 90A alternator now. Use to know the
> amperage output but now guessing in the 75A range. I have never had good
> results with using rebuilds, or at least the kind sold at auto parts
> stores. Quality over the years has been very poor.

While I might attempt dismantling the alternator (although I don't have
an impact wrench), the deterring factor now is the high price for the
voltage regulator replacement part. It costs more than the rebuilt
alternator, and the same price as a new alternator. No point in buying
just the part when I can get the entire unit for the same or cheaper
price. With a lifetime warranty (limited to the original car it was
installed in) and the much reduced price of a rebuild and the ease of
replacing the alternator (the belt and a couple bolts), I'll probably go
with the rebuild.
 >> Stay informed about: Alternator bad? Voltage regulator maybe? 

"Tony Hwang" wrote in <news:v309k.53678$gc5.53196@pd7urf2no>:

> VanguardLH wrote:
>> Car wouldn't start (an old '92 Subaru Legacy L wagon). Battery is about
>> 3 years old and the car started a week ago. However, today it just
>> cranked like one turn and died. I can hear the relay click as I turn
>> the key but the engine doesn't budge. I also noticed the electric seat
>> belt moved slowly.
>>
>> I popped the hood, jumped started from my other car, and with a
>> voltmeter measured across the battery. It measured 12.5V. As I recall,
>> each cell in a new battery should be 2.2 volts and there are 6 cells so
>> a new battery should measure 13.2 volts, so 12.5V isn't bad for a
>> middle-aged battery. However, I expected the voltage to be higher while
>> the car was running due to the output from the alternator. The voltage
>> also did not fluctuate when I revved the engine. It dropped a volt when
>> I turned on the headlights. So it looks like the alternator is bad.
>> While 16 years old, mileage is only 135K so, on average, the 2
>> alternators have lasted only about 67K which seems a bit short-lived
>> (actually the first one probably lasted 105K and the 2nd died after
>> another 30K).
>>
>> I had to replace this alternator about 4 years ago. The prior run
>> burned up. Its bearing went bad and it heated up so you could smell the
>> varnish on the windings within a few blocks of driving from cold. It
>> was a rebuilt and is now out of warranty. I got it for around $80. The
>> salvage place doesn't have another alternator (except for a
>> retail-priced new one). I can get one for $118 at PepBoys with a
>> lifetime warranty; however, I'm wondering if just the voltage regulator
>> is shot. I can't see what the module is on the outside so maybe the
>> regulator is inside. If inside, I'm not dismantling it to replace that
>> module. I suspect if it is inside that it'll be riveted and positioned
>> where it won't be easy to get out to replace it, assuming that just the
>> regulator can be purchased and is much cheaper. If the voltage doesn't
>> get above what the battery alone will provide, is it even a voltage
>> regulator problem?
>>
>> I can't find my battery charger so I'll call a buddy to drop by with
>> his. I need to charge the battery so I can get to PepBoys to have them
>> do an alternator test and have enough juice in the battery to start it
>> again to get the old Subie back home.
>>
>> What should be the voltage across the battery while the car is running
>> and with a working alternator? I thought it was 14.4V. It would have
>> to be higher than the 13.2V for a new battery.
>>
>> Is the voltage regulator inside or outside?
>>
>> How trustworthy are these parts shop alternator testers?
>>
>> Suggestions on how to go cheap on the alternator replacement? The
>> 1-year salvaged rebuilt alternator lasted 4 years. Considering it was a
>> third the price, another 4 years is just fine with me.
> Hi,
> Sounds like your battery is drained by some unknown load or it is bad.
> Probably one cell gone bad. If you can't test battery, try another one
> then yo can decide. When charging the voltage should be ~14V. Is the
> battery warm to touch?

No warmth to the battery (when unused or with the car running).

Even if the battery was bad, wouldn't the voltage across it go up due to
output from the alternator (when the car is running)?
 >> Stay informed about: Alternator bad? Voltage regulator maybe? 

VanguardLH wrote:
> "Tony Hwang" wrote in <news:v309k.53678$gc5.53196@pd7urf2no>:
>
>> VanguardLH wrote:
>>> Car wouldn't start (an old '92 Subaru Legacy L wagon). Battery is about
>>> 3 years old and the car started a week ago. However, today it just
>>> cranked like one turn and died. I can hear the relay click as I turn
>>> the key but the engine doesn't budge. I also noticed the electric seat
>>> belt moved slowly.
>>>
>>> I popped the hood, jumped started from my other car, and with a
>>> voltmeter measured across the battery. It measured 12.5V. As I recall,
>>> each cell in a new battery should be 2.2 volts and there are 6 cells so
>>> a new battery should measure 13.2 volts, so 12.5V isn't bad for a
>>> middle-aged battery. However, I expected the voltage to be higher while
>>> the car was running due to the output from the alternator. The voltage
>>> also did not fluctuate when I revved the engine. It dropped a volt when
>>> I turned on the headlights. So it looks like the alternator is bad.
>>> While 16 years old, mileage is only 135K so, on average, the 2
>>> alternators have lasted only about 67K which seems a bit short-lived
>>> (actually the first one probably lasted 105K and the 2nd died after
>>> another 30K).
>>>
>>> I had to replace this alternator about 4 years ago. The prior run
>>> burned up. Its bearing went bad and it heated up so you could smell the
>>> varnish on the windings within a few blocks of driving from cold. It
>>> was a rebuilt and is now out of warranty. I got it for around $80. The
>>> salvage place doesn't have another alternator (except for a
>>> retail-priced new one). I can get one for $118 at PepBoys with a
>>> lifetime warranty; however, I'm wondering if just the voltage regulator
>>> is shot. I can't see what the module is on the outside so maybe the
>>> regulator is inside. If inside, I'm not dismantling it to replace that
>>> module. I suspect if it is inside that it'll be riveted and positioned
>>> where it won't be easy to get out to replace it, assuming that just the
>>> regulator can be purchased and is much cheaper. If the voltage doesn't
>>> get above what the battery alone will provide, is it even a voltage
>>> regulator problem?
>>>
>>> I can't find my battery charger so I'll call a buddy to drop by with
>>> his. I need to charge the battery so I can get to PepBoys to have them
>>> do an alternator test and have enough juice in the battery to start it
>>> again to get the old Subie back home.
>>>
>>> What should be the voltage across the battery while the car is running
>>> and with a working alternator? I thought it was 14.4V. It would have
>>> to be higher than the 13.2V for a new battery.
>>>
>>> Is the voltage regulator inside or outside?
>>>
>>> How trustworthy are these parts shop alternator testers?
>>>
>>> Suggestions on how to go cheap on the alternator replacement? The
>>> 1-year salvaged rebuilt alternator lasted 4 years. Considering it was a
>>> third the price, another 4 years is just fine with me.
>> Hi,
>> Sounds like your battery is drained by some unknown load or it is bad.
>> Probably one cell gone bad. If you can't test battery, try another one
>> then yo can decide. When charging the voltage should be ~14V. Is the
>> battery warm to touch?
>
> No warmth to the battery (when unused or with the car running).
>
> Even if the battery was bad, wouldn't the voltage across it go up due to
> output from the alternator (when the car is running)?
Hi,
No. because bad battery will load down the alternator like a partial
short. It happens when one electrodes inside battery cell shorts out.
Generally batteries cause more trouble than alternaotr/VG. Even brand
new battery can fail. One factor of better battery is mechanical rigidity.
 >> Stay informed about: Alternator bad? Voltage regulator maybe? 

"Tony Hwang" in <news:g8i9k.29372$kx.28582@pd7urf3no> wrote:

> VanguardLH wrote:
>> "Tony Hwang" wrote in <news:v309k.53678$gc5.53196@pd7urf2no>:
>>
>>> VanguardLH wrote:
>>>> Car wouldn't start (an old '92 Subaru Legacy L wagon). Battery is about
>>>> 3 years old and the car started a week ago. However, today it just
>>>> cranked like one turn and died. I can hear the relay click as I turn
>>>> the key but the engine doesn't budge. I also noticed the electric seat
>>>> belt moved slowly.
>>>>
>>>> I popped the hood, jumped started from my other car, and with a
>>>> voltmeter measured across the battery. It measured 12.5V. As I recall,
>>>> each cell in a new battery should be 2.2 volts and there are 6 cells so
>>>> a new battery should measure 13.2 volts, so 12.5V isn't bad for a
>>>> middle-aged battery. However, I expected the voltage to be higher while
>>>> the car was running due to the output from the alternator. The voltage
>>>> also did not fluctuate when I revved the engine. It dropped a volt when
>>>> I turned on the headlights. So it looks like the alternator is bad.
>>>> While 16 years old, mileage is only 135K so, on average, the 2
>>>> alternators have lasted only about 67K which seems a bit short-lived
>>>> (actually the first one probably lasted 105K and the 2nd died after
>>>> another 30K).
>>>>
>>>> I had to replace this alternator about 4 years ago. The prior run
>>>> burned up. Its bearing went bad and it heated up so you could smell the
>>>> varnish on the windings within a few blocks of driving from cold. It
>>>> was a rebuilt and is now out of warranty. I got it for around $80. The
>>>> salvage place doesn't have another alternator (except for a
>>>> retail-priced new one). I can get one for $118 at PepBoys with a
>>>> lifetime warranty; however, I'm wondering if just the voltage regulator
>>>> is shot. I can't see what the module is on the outside so maybe the
>>>> regulator is inside. If inside, I'm not dismantling it to replace that
>>>> module. I suspect if it is inside that it'll be riveted and positioned
>>>> where it won't be easy to get out to replace it, assuming that just the
>>>> regulator can be purchased and is much cheaper. If the voltage doesn't
>>>> get above what the battery alone will provide, is it even a voltage
>>>> regulator problem?
>>>>
>>>> I can't find my battery charger so I'll call a buddy to drop by with
>>>> his. I need to charge the battery so I can get to PepBoys to have them
>>>> do an alternator test and have enough juice in the battery to start it
>>>> again to get the old Subie back home.
>>>>
>>>> What should be the voltage across the battery while the car is running
>>>> and with a working alternator? I thought it was 14.4V. It would have
>>>> to be higher than the 13.2V for a new battery.
>>>>
>>>> Is the voltage regulator inside or outside?
>>>>
>>>> How trustworthy are these parts shop alternator testers?
>>>>
>>>> Suggestions on how to go cheap on the alternator replacement? The
>>>> 1-year salvaged rebuilt alternator lasted 4 years. Considering it was a
>>>> third the price, another 4 years is just fine with me.
>>> Hi,
>>> Sounds like your battery is drained by some unknown load or it is bad.
>>> Probably one cell gone bad. If you can't test battery, try another one
>>> then yo can decide. When charging the voltage should be ~14V. Is the
>>> battery warm to touch?
>>
>> No warmth to the battery (when unused or with the car running).
>>
>> Even if the battery was bad, wouldn't the voltage across it go up due to
>> output from the alternator (when the car is running)?
> Hi,
> No. because bad battery will load down the alternator like a partial
> short. It happens when one electrodes inside battery cell shorts out.
> Generally batteries cause more trouble than alternaotr/VG. Even brand
> new battery can fail. One factor of better battery is mechanical rigidity.

Took the battery to the car shop. The first handheld tester said Good
(but a recharge was needed but I already knew that). That included a
check for the short condition. Then they shoved in the big tester that
first charges the battery for 30 minutes (ho hum, wander the store) and
it tested okay. They also plug in the cold-cranking amp rating to check
the battery can supply that load (although 85F outside and 70F in the
store isn't really "cold"). Couldn't find my trickle charger at home so
picked up a 3-stage one at a different store where it was cheaper and am
charging the battery tonight. That's because this car shop says they
can test the alternator while in-place but it requires the car can
startup on its own while testing. They have an emergency jump kit to
let me start and drive back home but they need the car to be able to
start itself using the battery and alternator without being jumped. So
tomorrow I find out more.
 >> Stay informed about: Alternator bad? Voltage regulator maybe? 

Ok, just my 2 cents.

Before killing the alternator, a battery with a dead cell can prevent
the voltage from the alternator from going to normal charge levels when
measured at the battery.

Clean the alternator connections, make sure that the Alt S fuse
connections are clean, make sure that the connector that plugs into the
alternator is clean. Make sure that the fusible link and main fuses are
clean. Mind the ground connections and battery terminals as well.

Also, make sure that the v-belt is in good shape and that i has the
proper tension. I have seen them slipping with no squeal.

Charge the battery and measure the voltage at the battery when cranking.
It should be more than 9 volts. When the motor is running, a properly
charged battery should see 14.2 to 14.8 volts in a properly regulated
system (those that allow batteries to last for 7 years, )

Good luck!





VanguardLH wrote:

> Car wouldn't start (an old '92 Subaru Legacy L wagon). Battery is about
> 3 years old and the car started a week ago. However, today it just
> cranked like one turn and died. I can hear the relay click as I turn
> the key but the engine doesn't budge. I also noticed the electric seat
> belt moved slowly.
>
> I popped the hood, jumped started from my other car, and with a
> voltmeter measured across the battery. It measured 12.5V. As I recall,
> each cell in a new battery should be 2.2 volts and there are 6 cells so
> a new battery should measure 13.2 volts, so 12.5V isn't bad for a
> middle-aged battery. However, I expected the voltage to be higher while
> the car was running due to the output from the alternator. The voltage
> also did not fluctuate when I revved the engine. It dropped a volt when
> I turned on the headlights. So it looks like the alternator is bad.
> While 16 years old, mileage is only 135K so, on average, the 2
> alternators have lasted only about 67K which seems a bit short-lived
> (actually the first one probably lasted 105K and the 2nd died after
> another 30K).
>
> I had to replace this alternator about 4 years ago. The prior run
> burned up. Its bearing went bad and it heated up so you could smell the
> varnish on the windings within a few blocks of driving from cold. It
> was a rebuilt and is now out of warranty. I got it for around $80. The
> salvage place doesn't have another alternator (except for a
> retail-priced new one). I can get one for $118 at PepBoys with a
> lifetime warranty; however, I'm wondering if just the voltage regulator
> is shot. I can't see what the module is on the outside so maybe the
> regulator is inside. If inside, I'm not dismantling it to replace that
> module. I suspect if it is inside that it'll be riveted and positioned
> where it won't be easy to get out to replace it, assuming that just the
> regulator can be purchased and is much cheaper. If the voltage doesn't
> get above what the battery alone will provide, is it even a voltage
> regulator problem?
>
> I can't find my battery charger so I'll call a buddy to drop by with
> his. I need to charge the battery so I can get to PepBoys to have them
> do an alternator test and have enough juice in the battery to start it
> again to get the old Subie back home.
>
>
> What should be the voltage across the battery while the car is running
> and with a working alternator? I thought it was 14.4V. It would have
> to be higher than the 13.2V for a new battery.
>
> Is the voltage regulator inside or outside?
>
> How trustworthy are these parts shop alternator testers?
>
> Suggestions on how to go cheap on the alternator replacement? The
> 1-year salvaged rebuilt alternator lasted 4 years. Considering it was a
> third the price, another 4 years is just fine with me.
 >> Stay informed about: Alternator bad? Voltage regulator maybe? 

Well. what was the problem?

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 >> Stay informed about: Alternator bad? Voltage regulator maybe? 

johninKY wrote:

> Well. what was the problem?

Been busy replacing air conditioners, rebuilding windows, and cleaning
the yard of debris and hauling it away. Just haven't gotten to working
on the car yet this week beyond getting the battery charged. My buddy
is coming over (maybe) this Saturday or Sunday to help with more debris
(which reminds me that I have to get busy with the chainsaw) and getting
rid of a removed water heater. Afterward, he'll accompany me when
testing the alternator just in case I need a ride back or a battery jump
(although the store says they have an emergency boost kit). While some
car shops say the alternator must be removed, this one says they can
test with the alternator in place but the battery must be in the car and
capable of starting the car itself (no boost, no jump). So, for now, it
looks like this job waits until this next weekend.

Hmm, come to think of it, I should put the charged battery back into the
car and connect it up. If there is a leak in the wiring or other
component (or even through the alternator) then I might see this by next
weekend (although the battery might still be good enough to start the
car so I'm not sure this test will reveal anything).
 >> Stay informed about: Alternator bad? Voltage regulator maybe? 

>
> Hmm, come to think of it, I should put the charged battery back into the
> car and connect it up. If there is a leak in the wiring or other
> component (or even through the alternator) then I might see this by next
> weekend (although the battery might still be good enough to start the
> car so I'm not sure this test will reveal anything).

Before you reconnect the battery, put an ammeter in series with the
positive cable. You will see any current draw. If you get a current draw
pull the plug on the alternator and see if goes away.
 >> Stay informed about: Alternator bad? Voltage regulator maybe?