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 help? Alternator tests okay but won't charge battery!
#789225
02/14/07 12:45 AM
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Anonymous
Unregistered
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My husband has a 88 Jeep Comanche that has over 300,000 miles on it. We recently had the entire clutch assembly replaced. Afterwards we started to experience problems with the alternator not charging the battery. We have a brand new battery, the alternator tests out okay and they are saying it is a ground wire problem but they can't seem to find it. Any ideas, thoughts, advice on how to fix this so the alternator will charge????? We would appreciate anything that you could do!
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 Re: help? Alternator tests okay but won't charge battery!
#789226
02/14/07 04:15 AM
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Joined: Oct 2003
Posts: 7,768
Web Wheeler
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Start by taking all the ground wires off and cleaning under them and then reinstalling! I do mean ALL of them. Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />
professional bovine relocation specialist
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Re: help? Alternator tests okay but won't charge battery!
#789227
02/14/07 02:09 PM
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Joined: Sep 2005
Posts: 692
Rock Warrior
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I was thinking it sounds like a bad ground wire too, ie one from an engine to chassis, like around the bell housing which you just removed to change the clutch.....
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Re: help? Alternator tests okay but won't charge battery!
#789228
02/15/07 01:55 AM
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Joined: Feb 2007
Posts: 6
Need a Spot
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yeah I think you have to check for some poor grounding or loose connection. then try to re-install your Jeep clutch. hope it helps.
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Re: help? Alternator tests okay but won't charge battery!
[Re: melody]
#789229
02/15/07 03:39 PM
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Joined: Jan 2007
Posts: 120
Wheeler
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WV...sometimes the problem can be attributed to the actual harness wires that connects to the alternator itself. This is a common problem with older Saturns.
The alternator also needs to put out at least 60% of it's peak Amp rating. For instanse, a 100Amp alternator needs to be making at least 60 Amps to sufficiently charge the battery.
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Re: help? Alternator tests okay but won't charge battery!
[Re: 93yj]
#789230
02/15/07 06:00 PM
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Joined: Mar 2005
Posts: 326
Mudrunner
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mabey the altinator just isnt putting out enough juice to charge the battery. when you did the test did you or they put a meter on it to see the volts its putting out. it should be around 12v. i think i would have to look it up but mabey someone else would know off the top of there head...
99 wrangler sport, auto. 2.5 inch lift, 31 MTR's
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Re: help? Alternator tests okay but won't charge battery!
[Re: tcoff]
#789231
02/15/07 09:06 PM
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Joined: Oct 2003
Posts: 7,768
Web Wheeler
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tcoff...at least 14 volts is needed to charge a 12v battery. Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />
professional bovine relocation specialist
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