This is the final hurdle for the planning of my YJ Hemi conversion, and is probably the most difficult. I'm working on getting a 5.7L Hemi out of a Ram pickup into my YJ. This can be easily done to Jeep TJ Wranglers because Teraflex offers a plug and play harness to match the Hemi's PCM to the Jeep TJ harness. However, they have not developed such a harness for a YJ.



http://www.teraflex.biz/pages/Hemi&#3...une%202005.pdf



I can still drop in the Hemi, but I'd have to use their "Hot Rod" harness which offers no function to the stock YJ gauges. Teraflex mentions something about older style "twisted pair" wiring in the gauges of 2001 and older Wranglers as being the reason for this.



Can anyone give me some advice on how to go about fabricating my own wiring harness, and would it work? I was thinking I could get wiring schematics from each a manual shift Hemi Ram and a manual shift 95 YJ and analyze them to see if anything can be done. I don't have much experience with wiring harnesses or PCM's, so any info you can give me will be a great help. Thanks

Sounds like quite the project. I'm sure this has been done somewhere. I'll check some other forums and see if I can find anything.

It'll be killer when it is done. Have you tried talking to the folks at Painless wiring. They may have what you are looking for or at least something that you can adapt. It would probably easier to adapt a harness than to start from nothing.

It'll be killer to say the least. I won't be able to get the project off the ground til next spring, but I plan to take pictures and document everything. Once I find the cheapest and easiest solution in which everything works I'll have something for others with YJ's to go off of.

Thanks for the info, I'll keep Painless wiring in mind.