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Old 01-09-2007, 11:14 AM   #1
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Rewire for 87 help needed

I just bought an 87 and looking for help. It's been a long time since I've had one. My last was a 79 cj. I'm having the lift done tomorrow. Now to my problems. It is a 6 cyl 4 spd. I looked at the wiring and someone really did a number on it. Someone cut the wiring harness and basically straight wired everything. I have only had a few moments to look at it but it's a mess. I took it right over to a local 4x4 shop to have them look it over and they are setting up the lift etc for me. Found a few other issues for me also. But when it comes to the wiring they have some good ideas but don't want to mess with it.
For example, there is a seperate switch for the cooling fan under the dash. It was changed to a manual choke carb. The computer was basically completely bipassed. I now want to either change it back to stock and then go from there, or someone mentioned to me converting to basically a fuel injected system. They said holley makes one and that it replaces a lot of the wiring etc. Wanted to know if anyone knew about this or has done it.
Also, with going back to stock, where could I get a good wiring diagram from to rewire everything and where to get the wiring harness. I am looking at ebay also. Will an 88 wiring harness work with the 87? I know I have my work cut out for me but I figured you guys would be a good place to start.
Any help from you guys would be great. I am planning a lot of work to this and want to make sure it's right.

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Old 01-09-2007, 11:24 AM   #2
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The stock carb was junk, which is why someone has done away with it. If you are from Philly as your name implies then you have emissions to deal with. I upgraded my Jeep with a Howell TBI fuel injection system. This system uses a GM throttle body and computer and comes complete with a wiring harness for about $1200. Living where it gets cold, you will definately love the advantages of fuel injection. There is also a Mopar kit available, but I have no experience with this one.

Welcome to the site. You will want to stick around. We have a lot of fun here and there are a bunch of knowledgable people here that can help you out. It sounds like you can use the help.

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Old 01-09-2007, 01:45 PM   #3
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Thanks for the reply. I actually live in Virginia now but I'm from the philly area. If I go with the tbi and it comes with the harness, is it complete or does it use some of the existing wiring as well. I was just over at the shop today to comfirm the lift etc and they werer talking about a jeep that they did the tbi conversion to at one point and they said if they remember correctly you had to use some of the existing harness.
Another question, will the wiring harness from an 88 work with an 87? I believe 88 had a 5 spd. I'm thinking about converting it to the 5 spd out of a 91. Is that a straight swap or is there some work to be done there.
I have worked on many a cars myself but I'm tired of so much trial and error. I figured this would be a great place to go so I'm not buying things that don't match up etc. Also, never hurts to know about new products or tips from others who have already done it.
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Old 01-10-2007, 11:30 AM   #4
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The TBI conversion does use a little bit of the existing harness. If the shop has good electrical knowledge it would most likely be best to start from scratch for the existing part. Now, the harness only addresses the engine, computer, fuel pump, sensors, relays, and guages. Any of the lighting and internal electronics are all still stock. As far as the 88 harness in an 87, I don't believe that there were any major changes between the two years. They both used the same drive trains. There are no electric controls on the auto tranny like the ones they use today. I can't say for sure, but I think it will work.
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Old 01-10-2007, 01:04 PM   #5
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Thanks for the info. It looks like you did the tbi change over. Did you do it yourself? how difficult was it. I'm going to start another thread on that to see what info I can get as some may not look for that in this thread. This site is great b/c I really want to do this right.
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Old 01-10-2007, 01:08 PM   #6
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Would you happen to know where I can get a good wiring diagram for my 87 so I can rewire it the correct way when I get a new harness?
Thanks again.
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Old 01-11-2007, 11:14 AM   #7
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You know, I had a hard time finding this myself. I ended up screwing it up and taking it to a guy to clean it up. He told me I only had one wire screwed up, so I was close. The instructions were pretty good and the tech support guys were great. I spoke with them almost daily for about a week. The mechanic actually found me a diagram, which got gear oil dumped on it in a move, now you can't read it. I have been told that a factory service manual has the required schematics. They are always on Ebay. I just haven't got myself one yet. I would recomend that you get one. It will answer a lot more questions than a Hanes or Chiltons will.
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Old 01-11-2007, 03:38 PM   #8
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Thanks for the reply. I did just pick up a 88 engine wiring harness for my 87 so that will get me started. I'm still looking into the tbi conversion. I need to do something. I will ck ebay for the wiring diagram. Maybe I'll get lucky.

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