Trailer Adapter wiring -
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post #1 of 3 Old 06-04-2004, 04:08 PM Thread Starter
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Trailer Adapter wiring

I have a 93 Grand Cherokee Limited that had a factory installed Towing package installed. Just recently the wiring adapter went kaputs on me, upon further inspection I can see that the metal contacts have pretty much disintegrated.

This has been down here 11 plus years and all the screws are pretty rusty making it impossible to take the adapter apart correctly. Anyways, this is an old Jeep, and the only thing I pull with it is a small boat trailer with one of those flat 4 wiring harness. I am trying to wire one of those in directly to the existing wires that where installed to the adapter. I am having a hard time figuring out which wire goes where.

I am pretty sure the green and tan wires are the left and right turn signals. Then I am torn between the larger Blue or Black wire as being the ground. And then I suspect the Black/red wire is the running light, but it could also be the Blue/red wire as well. I have tried to twist the wires together to do some checking before I due a more permanent job and heat wrap them.

Does anybody know where to go to find which wire means what on a factory installed wiring harness?

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post #2 of 3 Old 06-04-2004, 04:51 PM
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1996 ZJ 
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Location: Belle, WV
Posts: 4,930
I know they are not ZJ's, but I imagine the WJ's would be pretty much the same in this regard. Take a look here


Black 1996 5.2L ZJ Limited
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post #3 of 3 Old 06-04-2004, 05:12 PM Thread Starter
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Great that helps alot in case anybody is wondering it goes like this

Blue/Red = Running lights
Black= Ground
Green= Left Turn
Tan=Right Turn

I may have the turns backwards I have some more testing to do. I also discovered fuse #1 by the pasenger side of the console panel was blown, that is why none of it would work at all with all of my testing.

The original problem is still there though, it seems the brake lights and the flashers work fine, but the turn signal will flash both lights instead of one or the other. Also the running lights at night will not come on (this is all in the trailor only). I am noticing that one of the bulbs on the trailers may be out, could this cause this problem? Also the Red/Black wire was completely rotted through with bluish green corrosive, I presently have it going no where, on the diagram it has it listed as "Fused B(+)", should I have it crossed over with another wire?

I have gone through the rest of the fuses they look fine, as long as I have got it this far I can tow during the day and use hand signals. But it would be nice to be able to tow at night as well. This is kind of confusing, I am use to running everything off of the tail lights, but it looks like the Cherokees don't work that way (sucks to diagnose).
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