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Unread 02-14-2014, 08:11 PM   #1
ThisGuyUKnow
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1985 CJ7 
 
Join Date: Jul 2008
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Is There Any Interest in Modified 4.0 Harnesses

Alright everyone I wanted to make this article to gauge if there is any interested in harnesses from 4.0 donors thinned out for 4.0 and 258/4.0 hybrid conversion projects.

So far I have done two of these, one for my first CJ7 and another just last week for a forum member. He is still waiting for some other parts so once he gets that up and running and verifies that I can actually make a decent usable harness I will be ready to do more if people are interested.

Here is what I did:
1. Removed all wires and circuits from the donor that are not needed for the CJ conversion, IE headlamps, washer motor, XJ/YJ guages, etc..
2. Tested all the wires and connections to the ECM and isolated/tested all ecm/pdc grounds and power lines.
3. ID'd and labeled all the necessary wires to splice into the CJ harness for operation.
4. Removed all unused ckts, rlys, and fuses from the PDC. In the one I just did, I used two of the unused rlys to bypass the Headlamp switch, pending testing, this could be an added feature.
5. Altered the Harness to work properly with the SI style Alternator from the cj so that the charging system works through the PDC, i find this to be cleaner as it will reduce the amount of wires running around under the hood.

Here are some pics I took:
The Donor harness


The finished, thinned out harness


The excess wiring that was removed


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Unread 02-15-2014, 12:22 PM   #2
Dngrs1
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I may be interested in a harness for a 4.0L head conversion with MPFI on a 258c.i.. I have a complete '91 4.0L engine with intake, fuel rail/ injectors, sensors, etc. but no harness or computer. I have not been able to, so far, find a donor vehicle in the wrecking yards, here. Of course, price would be the deciding factor.
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Unread 02-15-2014, 01:59 PM   #3
ThisGuyUKnow
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Quote:
Originally Posted by Dngrs1 View Post
I may be interested in a harness for a 4.0L head conversion with MPFI on a 258c.i.. I have a complete '91 4.0L engine with intake, fuel rail/ injectors, sensors, etc. but no harness or computer. I have not been able to, so far, find a donor vehicle in the wrecking yards, here. Of course, price would be the deciding factor.
Im using the Hesco conversion prices for a little bit of a guide. Their complete kit
http://www.hesco.us/products/7902/40...5#.Uv_SuPldW8A Comes with eveything you need except intake, head (if you are doing a 4.0/258 hybrid), and exhaust manifold.

Their wiring harness only http://www.hesco.us/products/7902/40...8#.Uv_TWvldW8A is 529. This is what I would be making.

You would still need to purchase the CPS relocator kit if you are not using a 4.0 tranny and flywheel, your own fuel pump, and either buy new of find the correct vss from a part out. Those parts combined can be pricey.

The prices I am thinking are 100 if you send me a good usable harness from a donor. 250 if I have to find one, this would cover the cost of the harness which can vary depending on if its a junkyard or a part out as well as the time it takes for me to go out and remove it from the donor.

That keeps it at below half of what it would cost to get the hesco kit and then even with the expensive pieces you have to buy new you could keep the whole conversion close to or under 1000 bucks vs 1700 for the hesco and 2500 for the MOPAR kit.

A note on the PCM, if I pull the harness that price is for the wiring harness only because I can't guarentee the PCM funtion, I dont have a 4.0 or 258 jeep anymore that I can plug the ECM into to test its operation. If a pcm comes with the harness when I pull it I will send it to you as extra but without a way to test it I couldnt guarentee its function.
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Unread 02-16-2014, 03:41 PM   #4
ThisGuyUKnow
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Im guessing the low views and responses would mean the interest really isn't there to do alot of these. DNGRS PM when your project gets along far enough to need a harness and I can make you a harness or just share the notes you'd need to do it yourself.
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Unread 02-16-2014, 07:17 PM   #5
rshaffer89YJ
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I have recently finished this conversion and wish I had run across you post months ago. The harness I have in has way to much stuff in it and I've been having trouble thinning it out. Any tips that you have would be greatly appreciated. Thanks
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Unread 02-17-2014, 10:46 AM   #6
Dngrs1
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Quote:
Originally Posted by ThisGuyUKnow View Post
DNGRS PM when your project gets along far enough to need a harness and I can make you a harness or just share the notes you'd need to do it yourself.
Thanks, I do appreciate that.
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Unread 02-17-2014, 11:00 AM   #7
Gigemags05
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I really, really wish that this service was around when I was doing this swap. I would have for SURE paid you to do it. I ended up using Hesco's harness, which worked out very nicely. But man it was expensive. I looked for a long time trying to find someone to do exactly what you are talking about and couldn't find it.

I think its a great service. Good Luck.
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Unread 02-17-2014, 11:53 AM   #8
ThisGuyUKnow
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Quote:
Originally Posted by rshaffer89YJ View Post
I have recently finished this conversion and wish I had run across you post months ago. The harness I have in has way to much stuff in it and I've been having trouble thinning it out. Any tips that you have would be greatly appreciated. Thanks
If you want to pull the harness and send it to me I can thin it out for you. Did you use an OBD1 or OBD2 harness?
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Unread 02-17-2014, 12:06 PM   #9
rshaffer89YJ
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That is a good question, I'm not certain what the difference between the two harnesses is
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Unread 02-17-2014, 12:11 PM   #10
ThisGuyUKnow
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Quote:
Originally Posted by rshaffer89YJ View Post
That is a good question, I'm not certain what the difference between the two harnesses is
Ok haha, Ill ask it a different way, What year and model was your donor?
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Unread 02-17-2014, 12:20 PM   #11
rshaffer89YJ
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A 93 Cherokee I believe, pulled it a while back
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Unread 02-17-2014, 12:22 PM   #12
ThisGuyUKnow
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Quote:
Originally Posted by rshaffer89YJ View Post
A 93 Cherokee I believe, pulled it a while back
OBD1. I could clean that u for you no problem
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Unread 02-17-2014, 04:09 PM   #13
rshaffer89YJ
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I'll keep that in mind a few more things to try before I give up, thank you though
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Unread 02-17-2014, 04:11 PM   #14
ThisGuyUKnow
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Quote:
Originally Posted by rshaffer89YJ View Post
I'll keep that in mind a few more things to try before I give up, thank you though
do you have the project running?
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Unread 02-17-2014, 04:49 PM   #15
rshaffer89YJ
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I do its been running for a while and drives well just trying to make things loom nice and not 100 % sure that I have the speed sensor form the transmission hooked up right
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