Novak Conversions Jeep Wrangler YJ shifters

Turning Headlights Off Kills Engine!!

Jrod1774

New Member
Joined
Apr 20, 2026
Messages
2
Location
Dallas
So, i have a 1991 Jeep YJ with the 4.0 engine, it's pretty good, works really well, reliable, etc.

Recently it has developed an oddyty, 2 or 3 times out of 10 with the engine running and headlights on, when I switch the lights off almost kills the engine, it almost dies and after like 2 seconds pick it up. Like I would have disconnect the coil for a second.

I cleaned all the grounds, repair (clean and restored) the rheostat, there's no weird radio wire, and still does it.

I also try running it with the rheostat disconnect before the cleanup and it didn't die, but maybe it was just for the times I try it.

Any help?
 
alternator going out. bad battery or could be a ground wire.
I'm thinking it's the alternator because it was from one day to the other, I mean, no cables were messed around to suddenly be bad, although I put a voltmeter and it's charging fine. Steady almost 14 volts
 
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Novak Conversions Jeep Wrangler YJ shifters