Overcharge from???
Thread Starter
Newbie
Joined: Sep 2017
Posts: 2
Likes: 0
From: Mobile AL
Year: 1997
Model: Grand Cherokee
Engine: 4.0
Overcharge from???
Look, I'm new to auto work. I took on tinkering with the old girl to
keep myself from going mad with boredom. I don't know the codes
nor the alphabet soup. Now you know...
OK, my '97 ZJ 4.0 has developed an odd quirk that scares me. Once in a while it will suddenly peg out my voltage meter. I immediately pull over, shut her down, restart, and all is well. May go days before it happens again. Then again, it may happen 3 times in a 5 mile store run.
Ideas?
keep myself from going mad with boredom. I don't know the codes
nor the alphabet soup. Now you know...
OK, my '97 ZJ 4.0 has developed an odd quirk that scares me. Once in a while it will suddenly peg out my voltage meter. I immediately pull over, shut her down, restart, and all is well. May go days before it happens again. Then again, it may happen 3 times in a 5 mile store run.
Ideas?
Last edited by KK4AXX; Oct 12, 2017 at 05:10 AM.
Old fart with a wrench
Joined: Nov 2010
Posts: 14,398
Likes: 741
From: Manlius, east of Syracuse, NY
Year: 2000 XJ Sport & WJ Laredo
Model: Grand Cherokee (WJ)
Engine: 4.0L
Okay....I'd say take the alternator out and get it tested at an auto electrics shop. You may have a rectifier that's shorting out now and then. An alternator without a rectifier puts out 3 phase AC current.
CF Veteran
Joined: Nov 2015
Posts: 2,863
Likes: 201
From: syracuse ny
Year: 1997 230,000 miles
Model: Grand Cherokee (ZJ)
Engine: 4.0, new lifters valve job with new springs and exhaust valves, preload set with shims
If your battery is not well connected to the charging system, you will see the voltage of the system on your dash spike up, as there is no battery to load it.