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Unread 05-30-2011, 11:20 PM   #1
psychoteen101
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1996 XJ Cherokee 
 
Join Date: Feb 2010
Location: Gurnee
Posts: 661
GEN light on

My Cherokee is having an intermittent problem with the charging system. The gen light will come on randomly when driving, but if i shut the vehicle off, then restart it, it will go off for a while, then eventually comes back on. The voltage guage reads extremely low. Like around 9 volts. It doesnt run rough or anything, so im almost thinking its not the alternator. Maybe a false reading? Im thinking the next step is to obviously see what the output voltage of the alternator is actually reading. If its still ok, what could the problem be? Voltage regulator possibly?

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1996 Jeep Cherokee- Project-- Rusty's 8in long arm, SYE kit, Teraflex driveshaft, Cragar soft 8's 15x10 with 33x12.5 Firestone Destination MT's, Eaton Tru Trac in the front
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Unread 05-31-2011, 06:05 AM   #2
tjwalker
It's the crank sensor!
 
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1999 XJ Cherokee 
 
Join Date: Nov 2007
Location: Central Minnesota, MN
Posts: 8,513
*I always verify this with a meter at the battery to be sure it is real. Only takes a minute. You really need confirmation.

*Be sure all connections including battery, grounds and alternator are tight and corrosion free.

The "target" voltage that you should have with a healthy battery and charging system is around 13.5 to 14.0 volts.

Low voltage is almost always alternator related. If the voltage regulator goes south (located inside the computer), that usually results in an unregulated charging condition, which would be high voltage, not low.
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Unread 05-31-2011, 09:04 AM   #3
justanotherjpr
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X2 check all grounds especially the mesh strap at the back of the head leading to the firewall.
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