99XJ won't start... again.

SStone

Well-Known Member
Joined
Dec 26, 2008
Location
Sylva
Alright so I've been through this same thing a few months ago and never found the solution, the Jeep just decided to start back up last time.

I removed the alternator and had it tested a month or so ago, it tested good, so did the battery. Fast forward to this past Friday. I went out to start it up and there were no interior lights. Hooked my dad's vehicle up to it with jumper cables... they did nothing. I let it sit for about ten minutes and went back out to check it. I opened the door and the interior lights came on and it started right up first try. It died again 15 minutes later at a gas station and I let it sit for a few and it started again. As I got back on the road, the volt-meter on the gauge cluster spiked all the way to 19 (max) and stayed there. When I got back to the house later that night, that was it for the XJ. It now has no life. All fuses/relays are good and so are the battery connections.
 
I had a problem kind of like that a while back on my 98. Come to find out it was a ground. I had to pay out the butt to get a guy to figure out what was wrong with it.
 
If your voltage guage hit 19 volts, the alternator voltage regulator is bad. Probably toasted the battery in the process. Also, who did you have test the batt and alt. Vato zone and the like only look at voltage. The alternator might put out 14 volts, but when it's under a load will not put out any amps. I went through this with my yota when my air conditioner finally killed the stock alternator. I couldn't find a reman that worked, so I finally had to have a custom GM one wire built. As for the no start, it could very well be a ground. Check where the battery cable attaches to the body of the truck. and if there is one from the engine to the body. (Not sure if you have that one)
 
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