Alt volt regulator.......hmmmm -
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Go Back > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > Alt volt regulator.......hmmmm

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Unread 10-25-2009, 11:31 AM   #1
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1993 YJ Wrangler 
Join Date: Sep 2007
Location: NH
Posts: 454
Alt volt regulator.......hmmmm

So iv been having this charging problem with my GC.Ran all new cables,battery,etc. Still didnt do the job.
So i brought the alt to get tested and they said its all good except the regulator on it is many/to less of v's going out.... He told me the black back is the volt regulator.
2 bolts and a phillips and go to jeep stealership and get a new one/install it.

My question is can u even get a v regulator for the alt?
If so were at besides stealership?
Or just get a new alt?

1993 Black YJ
All Terrain 33's-4 inch RC lift
Revolver shackles- some other stuff
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Unread 10-25-2009, 11:42 AM   #2
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1995 ZJ 
Join Date: Feb 2005
Location: New Mexico
Posts: 6,543
Not sure what's inside that little black box. The FSM diagrams ignore it. Its not the regulator. The two small posts connect to the field coil inside the alt, which the PCM uses to regulate the system voltage. I'd try another alt at this point. If it still won't regulate, it could be PCM or wiring.
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Unread 10-25-2009, 06:57 PM   #3
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2003 WJ 
Join Date: May 2006
Location: Olean, New York
Posts: 2,032
yeah the regulator is built into the computer on these
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Unread 10-25-2009, 07:20 PM   #4
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1997 ZJ 
Join Date: Dec 2008
Location: , Alabama
Posts: 8,435
The brushes are easy to change. Go to local alternator shop and ask for a brush pack for whatever brand you have. 10-15 bucks.

But it could be a diode or capacitor too... not to mention bearings...
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