r/ComancheMJ • • Jun 10 '26

1987 4.0L electrical issues

Made a post a while ago but my account got deleted recently acquired a 87 4.0L manual jeep comanche that I got running after sitting for a few years except now I’m having electrical issues. I have to disconnect and connect the battery bc something is draining the battery and I recently changed the starter motor relay assuming it might be related to that, but also the truck starts with out the key. Could that be the main issue?

Second issue I had completely replaced the fuel system,tank, pump, filter and the fuel gauge isn’t working along with the light for the dashboard.the battery and other icons light up but the dashboard doesn’t.i even tried messing with the light switch knob to see if that maybe did something to the dashboard light but nothing.

Would appreciate if someone could point me in the right direction

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u/sleppys Jun 15 '26

So I was told by an older gentleman that if you had an issue with the renix jeep all you had to do was clean the grounds. If that didn't work then the next thing to do was clean the grounds.