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90PioSport99

Adapting MJ headlight harness to 97+ XJ harness

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Also, in case anyone is interested in a visual aid, this is a picture I took and made notes on (gotta love the Note 3) after using a multi-meter to figure out what wire did what.

 

Screenshot_2016-07-14-15-25-04-1.jpg

 

This is on my '92, btw.

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Looks like my harness has;

 

2   Red/Org (instead of White)

3   Green x2 (instead of Grey)

4   Dark Blue/Red (instead of plain Dark Blue)

5   Black (same)

6   Empty (same)

7   Purple (instead of Light Green)

8   Tan x2 (instead of Brown)

9   Empty

10 Empty

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Yeah, that is one thing I cringed at when I pulled the harness off. I cleaned it out real good an put some dielectric grease on the contacts while I was in there.

Hope that doesn't come back to bite you in the azz; it usually does. Dielectric grease should never be used on electrical contacts as it's non-conductive. It's use is for coating the connector mating surfaces to keep out moisture.

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If you alter the 97+ harness to the stock MJ plug I should still fit in some relays somewhere.. but where exactly

 

or should I skip trying to fit this to my plug and just build a harness that plugs into the factory headlight plug and just uses the head plug off of one for the high and low beam signal

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This was a huge help. Thanks for The thread on this topic but, I have black with white signal left over coming off of my 1999 harness and it shorts out fuses when I tried hooking it up to any of my 1989 headlight harness. I have high beams and low beams but my singals don't work while headlights are on. Last step on finishing my Comanche build. 

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