1991 to 1994 engine wiring harness - Chevy Impala SS Forum
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post #1 of 2 (permalink) Old 03-18-2016, 05:08 PM Thread Starter
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Join Date: Nov 2012
Location: Texhoma Oklahoma side
Posts: 2
1991 to 1994 engine wiring harness

Ok so long story short I've managed to cut one to many wires out on my 1991 caprice engine harness all the way down to the firewall connector and threw away the plugs. With this I'm in search of a new harness. The reason I'm doing this is to clean up the engine bay after dropping a ls 5.3l in it.

Ive got a friend that is parting out a 94 - 96 but I'm not sure if a 94 - 96 engine harness will line up the same with all the accessories like the front lights, wipers, R4 pancake A/C system ect... .

So need some help here everyone. Wife is only giving me a few month to get the car finished or get rid of it for a minivan.

Oh side note the windshield wipers motor on my 1991 has 2 plugs on it who knew.
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post #2 of 2 (permalink) Old 03-19-2016, 09:47 PM
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Join Date: Feb 2009
Location: Largo, FL 33774
Posts: 10,865
The 91 harness is a one year only item.

All of the wiper motors have two connectors.

The difference between the 91 and 92/93 harnesses are not too many.

The 92/93 front washer motor leads loop through the firewall, and there are two vacuum lines for the 91 vs. the 92/93.

The second vacuum line powers the valve to block water from entering the heater core. The vacuum line must be closed or you will port vacuum under the dash when you use the heat.

You would have to rewire the washer motor to the correct pins on the small wiper motor connector. The circuit goes under the engine at the front, and travels with the alternator wire.

The 94 harness is totally different.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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