Question about 1986 Jeep Comanche

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I turn ignition switch "on" and weird electrical problems happen.

I just overhauled a 1986 Jeep Comanche with a 2.8 L V6.
All said and done runs great. Yesterday I tried to turn it on and it didn't even kick or do ANYTHING. Checked it out again, used a test light to check all of my connections. I made sure the negative cable had a really good connection and it started working again. When I turn the ignition to on and fiddle with the lights or anything the sensors all turn dead (voltometer, oil pressure gauge, tempurature gauge everything except gas gauge). They work until I turn the lights on or touch any of the switches on the dash. I tried doing a brake booster check (holding the brake pedal down while shutting off the engine) and to my surprise, the truck stays idoling until I take my foot of the brake. THIS IS REALLY SCREWED UP.
The truck has been sitting outside so much that the fuse relays may have gotten wet and shorted something. But don't let this fool you. It didn't have any problems until one day it didn't start up. Now the lights won't turn on and when I try to turn them on the electrical system gets all screwy.
Please help, this is the final step to a 2 year project of mine. I'm so close to finishing it except this happened. Please give me all the info possible or any leads as to what to do.
-Thank You

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  • Jeep Master
  • 22,041 Answers

Wiring fault somewhere along the line,you have a backfeed into the ignition circuit when the lights are on by the description ??well all very well diagnosing it but its the finding it now----could be anything from a single pole bulb in the place of a double pole bulb in the rear side light/stoplight ,well on europeon model with seperate light lens/colours ,but stateside on older vehicles that are home grown you use a weird set up with stop light and indicators all doing funny things,i know this because i have had to rewire the things for an import to get mechanical inspection certificates.So you will have to look for it somewhere ,check rear light earths to chassis as well ,and the best of british mate because iam colour blind so you can imagine the problem i would have trying to do this ( red/green).Another tip if you have a towbar check the wiring plug/loom for chaffing in the chassis as this can cause feed back as well .i only get one reply by the way if you need more help so please dont think i have ignored you after one reply i just cant post it

Posted on Jan 16, 2009

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Posted on Jan 02, 2017

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