YJ electrical issues and more! - JeepForum.com
 
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post #1 of 9 Old 07-13-2021, 08:31 AM Thread Starter
waspp
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YJ electrical issues and more!

So I just bought a a beater YJ with a 2.5 and a 5 speed for a project, mostly to run on the national forest roads and trails that are near my property. I do however want to register and be able to use the jeep around town. The initial problem was it wouldn't shut off and upon looking it over I found some serious wiring alterations. Rather than try to sort this mess out I grabbed a complete harness on eBay and plan to start over. The pic shows the ignition coil with a wire plugged into the coil (to energize the coil I assume) but the wire is hot with 12v all the time and was run from the fuel pump relay. I'm guessing the coil should be receiving power from the ICM. That led me to notice no wires coming out of the distributor and sure enough no pickup inside the distributor. Maybe thats why the kid said it ran really rough going downtime road! Anyway I need to find a good engine harness wiring diagram to sort this out and hopefully get this rig running better. Any suggestions appreciated.

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post #2 of 9 Old 07-13-2021, 10:05 AM
93YJ4FUN
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1993 YJ Wrangler 
 
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What year is it?
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post #3 of 9 Old 07-14-2021, 12:30 AM
JOExFROMxNY
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If its an '88, try these:
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Engine wiring harnesses 2.5L 1988.jpg   Instrument panel harnesses 1988.jpg  
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post #4 of 9 Old 07-14-2021, 07:27 AM Thread Starter
waspp
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It's a 1990. Yes that would helpful joexfromxny...thanks
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post #5 of 9 Old 07-14-2021, 08:15 AM
jtec
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get a OEM manual, you will want the wiring diagrams.
Often when the fuel pump relay is involved in 'rewire' there is a lack of understanding of PCM time out.
1990 = renix. google 'cruiser54' a forum member and your new friend.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #6 of 9 Old 07-14-2021, 10:41 PM
SevenSlotAddict
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1990 YJ Wrangler 
 
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A member here has the FSM and the Electrical manual in .pdf to download from their signature. Hopefully someone will supply their name to help you. Sorry, Ive slept since I DL'ed it and dont remember who it is.
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post #7 of 9 Old 07-15-2021, 09:51 PM
xpage
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1994 YJ Wrangler 
 
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post #8 of 9 Old 07-16-2021, 04:31 PM Thread Starter
waspp
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Thanks much! I was able to find an article on 4wd mechanics that went over the way the tbi and electronic ignition system operates on the 2.5. The distributor has no pulse ring or pickup the advanced or retard is all done through the ecm and icm. I picked up an unmolested wiring harness so I hope I will be able to work through it and check the engine management sensors as I go.
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post #9 of 9 Old 07-26-2021, 01:29 PM
laybackman
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Looks like xpage posted it before I did!

Do you know what was good about the good old days? I wasn't good, And I wasn't old!

Found out Grandpa is addicted to Viagra. No one is taking it harder than Grandma...
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