Virtually all after market radios are mounted the same way. Buy the new
radio and look at how it goes in, odds are very good the current radio will
come out using the same tool the new radio has.
There is a bezel that is perhaps 3/16" that you pop off with a hook tool or
something equivelent. This will expose a slot along the left and right sides
that you insert a thin tool into to release a catch-spring, and the radio
simply slides out.
The new radio comes with a cage that you set into the radio hole, and bend
some tabs to hold it in place in the dash. The radio itself then slides into
this cage and a spring-clip latches onto a catch on the side of the radio
chassis. The old radio -- which is an after market unit -- will use the same
convention to mount it, although the actual parts will differ and may or may
not be compatible.
Youi will want to buy the connector that mimics the connector on the back of
the Factory Radio, and has the leads market LF, LR, RF, RR, Power, etc.,
that you splice to the connector pigtail that comes with the new radio. This
will allow you to build a pigtail that plugs into the back of the new radio
as well as the wiring harness on the truck. If the previous owner cut off
the factory connector, then you have to chase the wires down yourself. The
Pos and Neg speaker wires will be GRY & GRY/BLK, ORG & ORG/BLK, etc. for the
pairs that go to each speaker. RED is switched hot, YEL is constant hot, BLK
is ground. You need to verify these colors, but they should be right. If
there is a BLU wire, it is used for the power antenna. I don't recall that a
'96 Bronco has a power antenna, so there should not be one. If you still
have the factory connector, you don't need to know any of this because the
pigtail will be labeled as to what each wire goes to.
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