4.2L wiring help!

Hi all! I need a lot of help with wiring issue on 88 yj, 258, hei dist. Coil in cap. The wiring on my new ' jeep is mostly gone and what's left is unhooked... I know, why? I need to knowwhat color wires go where, any help is appreciated pics if Possible. I would like to just have hard minimum for wires. It also came with msd ignition but not hooked up...

 

Attack of Jeep ninja. . . hacked up all the wiring. . . Just ribbing ya.

Check out the following thread, and let us know if this helps? https://www.jeeps.net/threads/1990-yj-coil-voltage-icu-something-issues.1044/

 

Hopefully JTHM71 and Dbarlow will step in here and help out. I believe they both just performed this same swap on their YJs. Each I believe went a little different route. I believe D performed the nutter bypass prior to HEI installation, and J removed all computer electronics from his. If you need pictures of what they did, they would be the ones to ask. Check their thread above for some pictures on wiring and relays.

 

I looked at diagram, and tried to follow suit but have no spark, and think maybe some wires are missing or different color. If I knew what wires I needed and where they went it would help alot. I've got a fsm and haynes, but it's hard to make heads or tails without all wiring in place, and the wires have not been hacked and spliced. Jeep cranks over great, lights on dash come on as usual, but wiring is messed up somewhere, or coil in cap may be shot?i hope to get it going because i go back to work thursday... gf has zj but needa it for her job. Thanx for the help! Ill post some pics of what i stepped in on this yj when I get home....

 

Is the "coil" on the distributor MSD also. Did you install the HEI or did you get the jeep set up as is? Has it ever run set up as it is. Please post some pics of the distributor and msd ignition that you have. Is there a model # for either or both.

I would double check the Routing of the spark plug wires and make sure they are following the correct firing order.

 

Ok, sorry it's taking so long... I have a msd dizzy, that has coil in cap. It has run, and was strong... until p.o. decided to remove the ecm. I have taaaaken the msd box out of the equation until it's running, then put it in. I tried to test module, and coil, and believe coil is toast. i will try and post pics when I get to keep tonight. Thanx for any help!
Keep jeepin on!

 

When you run the HEI the ignition module should be removed. Run the switched power that goes to the module straight over to the HEI distributor. Your coil might be fine and just not getting power. Check the power coming into the distributor with the key in on position. I think JTHM71 had a similar issue. I think he had power going to the distributor with the key on, but when he cranked it cut power to the distributor. Make sure you have your starter relay wired correctly. I posted hand drawn pics in the previously mentioned thread as to how it should be wired There are 2 relays let me know if yours looks different (has an extra post not shown in the pic)

 

Hmmm, I'll have to check voltage while cranking... I got jeep as is, p.o. said was running great but he wanted to clean up the wiring mess... Well id hate to see what it was before! Pics soon, and with the push button starter po had wires direct to starter... ​

 

Oh, and msd is ignition module, and I just took it out until problem solved... owl brand of dizzy.

 

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