Engine swap wiring - JeepForum.com
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post #1 of 5 Old 03-24-2012, 08:13 PM Thread Starter
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1986 CJ7 
Join Date: Mar 2012
Location: Pleasant Grove
Posts: 3
Engine swap wiring

I have recently purchased a 86 CJ that has been highly modified with the 4.3L swap, I'm pretty mechanically inclined and can work my way around fab but not too skilled with the wiring aspect of the customization.

The original shop that wired the jeep must have not passed kindergarten cause its a mess and I mean mess... I'm new to the site here and couldn't find a search option to research before I post something that has probably been asked a million times,
But are there any wiring kits from painless or novak offered to rewire the jeep right and clean not using 20million splices 3 fuse blocks and wiring that doesn't work half the time.

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post #2 of 5 Old 03-25-2012, 10:31 AM
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2004 TJ Wrangler 
Join Date: Mar 2010
Location: Ontario Ca
Posts: 115
Ive had very good luck with howell fuel injection http://howellefi.com/
They use factory (gm) colors and connectors and components, their customer service is incredible. Ive been involved in a number of projects over the years with people using the other peoples harness and I will only use them.
My last project was a 2004 astro van 4.3 and 4l60 auto into a 1984 toyota pu. It had to pass Ca emissions when we were done. They didn't sell a harness and pcm for our application so they made one to order. After install we found out there was something in the pcm programming we needed changed. They sent us another pcm with return shipping free of charge.
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post #3 of 5 Old 03-27-2012, 10:02 PM Thread Starter
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1986 CJ7 
Join Date: Mar 2012
Location: Pleasant Grove
Posts: 3
Thanks, I sent them an inquiry on what I have going on. hopefully they can help. I'm really disappointed on the wiring, I have always heard good things about the place that wired it. had a buddy who had a nova rewind there and they did a good job. This wiring is scary kinda looks like a tweaker did it. if they can't help me at least i have a model to follow and redo it with a stock harness, or make my own (which I don't want to do)
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post #4 of 5 Old 04-03-2012, 08:10 AM
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1966 CJ5 
Join Date: Jan 2011
Location: Key Peninsula
Posts: 109
Depending on what year 4.3 it is, get a wiring diagram from a vehicle for that year with that engine. Start working your way through the wiring diagram one wire at a time to see how all of the connections you have on your jeep compare to stock connections.

I know it sounds tedious, but it really is pretty straightforward once you knuckle under and actually get started. There are a finite number of items that need to be connected correctly to the engine and the pcm, and with patience you can get them all wired properly.

You could also order a harness from painless wiring and start over, but that's pretty spendy.

Western Washington
'66 CJ5 under construction
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post #5 of 5 Old 04-04-2012, 03:14 PM Thread Starter
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1986 CJ7 
Join Date: Mar 2012
Location: Pleasant Grove
Posts: 3
Grayskies, yeah I may do that this next coming winter running out of time now that the rain should be stopping and time to get into working dirt for planting.

I went ahead and rewired the whole under dash mess they had going on and mad it much much cleaner and got all the gauges to work. Probably going to order up a new harness from howell or painless and tear into it and go through the old and mimic it to the new cleanly and right. and move the cpm to the inside of the cab. Id use the old harness but its so butchered it not even worth saving. the under dash harness into the steering column and gauges i started to do that and repair it but I ended up just replacing the whole thing with a homemade rewire...
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