GEN light on -
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back > Models > Jeep Cherokee & Comanche Forums > XJ Cherokee Technical Forum > GEN light on

Ruffstuff 10 year saleBDS 4-1/2" Suspension Lift Kit - Jeep Wrangler YJRough Country Lift Kits and Parts!

Unread 05-30-2011, 11:20 PM   #1
Registered User
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?

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
psychoteen101 is offline   Reply With Quote Quick reply to this message
Unread 05-31-2011, 06:05 AM   #2
It's the crank sensor!
tjwalker's Avatar
1999 XJ Cherokee 
Join Date: Nov 2007
Location: Central Minnesota, MN
Posts: 8,702
*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.
99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
tjwalker is offline   Reply With Quote Quick reply to this message
Unread 05-31-2011, 09:04 AM   #3
Registered User
Join Date: Nov 2007
Posts: 6,336
X2 check all grounds especially the mesh strap at the back of the head leading to the firewall.
Originally Posted by Motorcharge View Post
So do you actually hear your thoughts in your head or is it just sort of a dull roar before you smash your face into your keyboard and just submit whatever dumb **** ended up on the page?
justanotherjpr is offline   Reply With Quote Quick reply to this message

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools

Suggested Threads

Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. is not in any way associated with Jeep or the Chrysler Corp.