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Unread 07-10-2010, 06:02 PM   #1
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2000 XJ Cherokee 
Join Date: Jan 2009
Location: MA
Posts: 26
Alternator Trouble

I am having issues with my charging system and have not been able to find answers (after much searching). My Jeep was starting and showing 14V, then dropping to 9 and showing the check gauges light. After shutting off and making sure I had all good connections I started again and several times it was fine, then it would start and show 12V and then drop to 9 again after 200ft driving.

I figured it was a bad alternator so I got one from autozone that is a 136amp from a 98ZJ. I ground the brackets down to get it in but the wires to the back are different. The jeep has a green and green with black stripe that go to the plug but the new alternator has only 2 unmarked studs to attach the wires to.

Help!! The jeep starts but has the same issue of only showing about 10-12V while running. Any help would be appreciated.

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Unread 07-10-2010, 08:12 PM   #2
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1995 XJ Cherokee 
Join Date: Oct 2007
Location: Whitesburg, Tennessee
Posts: 5,288
As far as I know, one is a ground and the other is a power feed from the ECM that feeds whatever voltage into the field windings that is needed to keep it at 12V

My diagrams do not say which is which but from what I can see it doesn't matter because they both just feed into the ends of the field coil.

I say add some ring terminals hook it up and if it dont work, swap them.
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Unread 07-11-2010, 08:20 PM   #3
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2000 XJ Cherokee 
Join Date: Jan 2009
Location: MA
Posts: 26
Thanks for the help. I got it hooked up today and it has been working fine. I thought that it did not matter but as it goes directly to the ECM I did not want to screw it up. Jeep forum saved me again, thanks
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4.0l , alternator , alternator replacement , voltage drop
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