Alternator Trouble -
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 > Alternator Trouble

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineWeekend sale!! Our dual battery tray on sale $199FS: 2007-2013 Jeep Wrangler "HALO" Angel Eye Kit

Unread 07-10-2010, 06:02 PM   #1
Registered User
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.

jpf3483 is offline   Reply With Quote Quick reply to this message
Unread 07-10-2010, 08:12 PM   #2
Registered User
1995 XJ Cherokee 
Join Date: Oct 2007
Location: Whitesburg, Tennessee
Posts: 5,293
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.
95' XJ Country - Stock Skids - D30/D35 Limited Slip - 3" Lift - 31x10.50R15 - 4.0 HO - AX15 - NP231

98' XJ Classic - D30/C8.25 - 4.5" RC Lift - 33x12.50R15 - 4.0 HO - AW4 - NP231
Originally Posted by Azzy View Post
You can tell the character of a person in how they treat someone who can do nothing for them.
Holder350 is offline   Reply With Quote Quick reply to this message
Unread 07-11-2010, 08:20 PM   #3
Registered User
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
jpf3483 is offline   Reply With Quote Quick reply to this message

4.0l , alternator , alternator replacement , voltage drop

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.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
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.