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Go Back JeepForum.com > General Technical Discussions > Stereos, CB & Ham Radios, GPS, & Electrical. > Volt meter = 12 volts for a minute then ~9.5

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Unread 10-09-2015, 08:50 PM   #1
thelazerviking
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2001 XJ Cherokee 
 
Join Date: Dec 2006
Location: Omaha
Posts: 48
Volt meter = 12 volts for a minute then ~9.5

EDIT: SOLVED! I TAPPED THE BACK OF THE ALTERNATOR WITH A HEAVY PIPE. SEEMS LIKE THE BRUSHES GET STUCK/ WORN OUT.

2001 XJ

The nut fell off my battery strap, it shook around and the caps came off, voltage dropped to 9..."check gauges" light comes on

Got a new battery and terminals, same problem.

I turn it off, start it up, 12 V, run it for 30-60 seconds and then the voltage drops down to ~9,9.5. This is consistent, every time for 2 days now.

Anyone seen this?



I'd rather change an alternator than PCM. Doubt it's a loose wire. I'll check the alternator tomorrow.

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Unread 10-22-2015, 08:19 PM   #2
CJ7-Tim
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2000 XJ Cherokee 
 
Join Date: Apr 2002
Location: out in the garage - Minneapolis, Minnesota
Posts: 24,076
Typically with later XJ and the TJ, if the voltage meter reads around 9 volts there is an alternator issue, usually sticky/worn brushes. If the voltage gauge reads 19 volts, there is a connectivity issue, and you need to look at the wiring and and wire connections to the battery and alternator. This is assuming your battery has tested good.
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