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91 Z28 Hatch Pull Down Wiring

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Old 11-05-2011, 04:24 PM
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Car: 1991 Camaro Z28
Engine: 5.7L
Transmission: 700R4
Axle/Gears: 3.23
91 Z28 Hatch Pull Down Wiring

I've done a lot of searching and none of the results match the wiring color I have so I am posting to see if someone can help. First, I have tested the motor and it works fine with I wire direct with 12v and ground it.

Attached are two images, 1 of the harness attached to the motor and the other is the mess of wires that come from behind the rear panel. Obviously the wiring is a mess and I can't figure out what goes to what.

The release latch in the console does not release the hatch and the motor does not go up and down unless I hard wire it with the wire labeled as 12v and ground it.

The first image is from the car and I tried to label the wires that I can identify. Odd that one of the black ones has 12v. The second image is of the harness.

Any help would be appreciated!
Attached Thumbnails 91 Z28 Hatch Pull Down Wiring-hatch_from_car_post.jpg   91 Z28 Hatch Pull Down Wiring-hatch_from_motor.jpg  
Old 11-05-2011, 05:04 PM
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Re: 91 Z28 Hatch Pull Down Wiring

That's because you've got the 91.5-92 setup instead of the 86-91.5 trunk pull down.

I can't help you, I don't have a 92 manual, and the 91 manual only shows the early style. Good luck.
Old 11-05-2011, 05:47 PM
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Car: 1991 Camaro Z28
Engine: 5.7L
Transmission: 700R4
Axle/Gears: 3.23
Re: 91 Z28 Hatch Pull Down Wiring

Well that does help some, still looking for some how-to's. I found a schematic but I'm not too good with those...
Old 11-06-2011, 07:10 PM
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Car: 81' Z28, 87' Iroc Z28, 05' GMC Z71
Engine: LB9 - 305 TPI - 190 H.P.
Axle/Gears: G92 - 3.23
Re: 91 Z28 Hatch Pull Down Wiring

I believe the schematic in PDF format, located in post #10 of this thread matches your car.

https://www.thirdgen.org/forums/inte...own-motor.html

Hope it helps. Post your results!
Old 11-07-2011, 05:20 PM
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Car: 1991 Camaro Z28
Engine: 5.7L
Transmission: 700R4
Axle/Gears: 3.23
Re: 91 Z28 Hatch Pull Down Wiring

When I hook the red-white together and ground the black wires from the hatch motor harness, the motor goes all the way down. If I shut the hatch and then open it with the key, it just pops open, no lift up. The only way I can get the hatch motor to go up is the remove the relay attached to the unit and wire the motor directly.
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