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post #1 of (permalink) Old 11-08-2002, 08:55 AM
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Cj wiring harness question - Are they all the same

Hey all,

I have an 84 CJ. I am doing a tub swap this winter, want to get the tub "done" before I put it on the frame. Which means I am going to be getting another harness for inside the jeep.

I want to be able to undo the harness in the jeep, put the new tub on, and plug it back in. Are all of the cj harness the "same"???
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post #2 of (permalink) Old 11-08-2002, 09:04 AM
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Re: Cj wiring harness question - Are they all the same

1. Not all model years are the same.
a. Fuseblock differences.
b. Input/ouput firewall to cabin fuseblock location differences.
c. Mode differencec, Tach/Clock, swiches, etc.
2. IMHO most harness', unless burned, are quite salvageable.
a. Review the schematic per your year.
b. Review the wiring and see if you can spot OEM from PO wires.
c. Remove all excess PO wiring.
3. You're better off seperating the fuse block at the firewall;
a. Taking dash/internal harness off as a unit.
b. Remove rear tub harness from underdash loom.
4. Clean up all underdash connections.
5. Place plastic sprial wrap on loom and tie down loom to dash.
6. Burish and tighten all spade connectors.
7. Burnis and tighten all grounds to gauges and gauge bodies.
8. Clean and burnish all internal fuseblock connections.
9. Check all terminations against the schematic, most are fairly accurate.
10. Put dialetric grease into the fuseblock maiting connector.
11. Re-mate rear tub harness to under dash harness.
12. Reassemble.
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post #3 of (permalink) Old 11-08-2002, 09:47 AM
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Re: Cj wiring harness question - Are they all the same

hmmmm.....just my .02.....

If you are going to re-do the tub, put the money in a nice aftermarket harness.....

Jeep used to do "FACTORY" duct tape!!!! All hacks made possible by AMC....just my thoughts tho...not to mention the newest CJ harness is 16 years old....
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post #4 of (permalink) Old 11-08-2002, 06:06 PM
 
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Re: Cj wiring harness question - Are they all the same

I installed a dash from a 84 CJ7 into my 79 CJ7. I changed the 84 fuse block to the 79 fuse block. Consequently, I have extensive notes about the wiring behind the dash on a 84 CJ7, including wire colors. Personally, I would follow Leve's advice and make my own wiring harness as required. If you do it that way, you will know where all those different colored wires connect and won't be out several hundred dollars for a new wiring harness. While I had the dash out, I followed CJDave's advice about grounds and installed a brass grounding block behind the dash. I ran all the dash grounds to that grounding block. I then ran a #6 wire to the main brass grounding block under the hood. Contact me if I can be any help identifying wires or colors.
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post #5 of (permalink) Old 11-08-2002, 06:38 PM
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Re: Cj wiring harness question - Are they all the same

My first choice would be a good factory harness if you can find one. You'll never get the connections made as well or as weathertight as the factory with an aftermarket or a DIY. There's nothing wrong with the duct tape, vinyl tape hardens over the years and also looses it's adhesion.

There are some differences year to year, but within the same year they should be the same. My '80 CJ did not come with air, clock or tach, still the wire for the compressor is in the harness and the sockets for the other options are present in the fuse block. Jeep used a bunch of option add-on wires that just plug into the fuse block. Auto manufactures went to one harness as it's cheaper to build only one, only one to inventory and no confusion if someone picks up the wrong one on the line.

</font><blockquote><font class="small">In reply to:</font><hr />
I followed CJDave's advice about grounds and installed a brass grounding block behind the dash. I ran all the dash grounds to that grounding block.

[/ QUOTE ]I found a Square D equipment ground strip at the Ace Hardware. It's aluminum, not as good as brass or copper, but still better than a steel frame ground.
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post #6 of (permalink) Old 11-09-2002, 07:59 AM
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Re: Cj wiring harness question - Are they all the same

This is a want of mine: a dash that I can fit my fat hand up behind to easily change a bulb or get to a plug. Maintenance friendly. To me this means a common bundle that runs the full width and just has long single wires or small bundles going where they have to. I have a complete '85 dash that I am going to do a mock up then transfer it to my '79, someday. Good Luck.
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