Jeep Cherokee Forum

Go Back   Jeep Cherokee Forum > Technical Discussion > OEM Cherokee Tech
Register Forgot Password?
Search


Welcome to Cherokee Forum!
Welcome to Cherokee Forum,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
 
 
submit to reddit
 
Thread Tools Search this Thread Display Modes
Old 12-09-2009, 04:37 PM   #1
Newbie
 
Join Date: Dec 2009
Posts: 4

View PatQuinn's Photo Album My Photos
Cherokee
Default Alternator/electrical problem

hey guys my 98 jeep cherokee keeps losing power. it will start up at about 12 volts and run ok (kind of rough) but as soon as i put on the headlights and/or radio the voltage drops down to 0. If i disconnect the battery while the car is running it cuts power immediately. Does this mean it is the alternator? Also 2 of the 4 bolts on the bottom of the alternator that connect the black peice with the green wire are broken off. could this be the problem? Thanks in advance.
PatQuinn is offline   Reply With Quote
Old 12-09-2009, 04:57 PM   #2
CF Veteran
 
BuckB91XJ's Avatar
 
Join Date: Nov 2008
Location: Oak Harbor, WA.
Posts: 6,972

View BuckB91XJ's Photo Album My Photos
1987 Cherokee
Default

First of all...NEVER DISCONNECT THE BATTERY CABLES ON AN XJ WHEN IT IS RUNNING!!!!!!! As soon as you said what the volt gauge was doing with the Jeep running and when you turned accessories on, I knew your alternator was bad. You're lucky if your ignition or ECU is not fried after pulling the battery cables with the motor running. You can take your alternator and battery to you local parts store and have them both tested for free. Check your battery and alternator wiring for cleanlkiness and security. Get your battery charged and replace your alternator and your Jeep will be fine again.
__________________
Brian "Buck" Buchanan, U.S. Navy Chief Petty Officer (RETIRED) - 87 XJ Laredo - 8.5" Rusty's Offroad/Rough Country lift, D30 trussed up and D44 high clearance shock mounts, 4.56's, Aussies and Disc Brakes front and rear, JCR Offroad Belly Skid Plate and Stage 2 Rock Sliders, Off Road Fab Winch Bumper and Quarter panel Guards, Liberal Front Wheel Well trimming and Rear Wheel Well Cut N Fold, 35" Goodyear MTR with Kevlars, Cobra CB and AW4 First Gear Lock Crawl switch, SYE, Stock XJ driveshafts front and rear and Milemarker SEC8000 Winch.

91 XJ Sport (Old Gray Jeep) - Layed to Rest (04-01-13)
87 XJ Laredo (Ole Red) - (My Jeep)
87 XJ Base (The Boys Jeep)
96 XJ Country (The Daughters Jeep)
08 Dodge Charger R/T (The Wifes Ride)
04 Silverado 2500HD Duramax/Allison (tow rig)
BuckB91XJ is offline   Reply With Quote
Old 12-09-2009, 05:06 PM   #3
Junior Member
 
Join Date: Nov 2009
Posts: 32

View g.mccormick's Photo Album My Photos
Cherokee
Default

Quote:
Originally Posted by BuckB91XJ View Post
First of all...NEVER DISCONNECT THE BATTERY CABLES ON AN XJ WHEN IT IS RUNNING!!!!!!! As soon as you said what the volt gauge was doing with the Jeep running and when you turned accessories on, I knew your alternator was bad. You're lucky if your ignition or ECU is not fried after pulling the battery cables with the motor running. You can take your alternator and battery to you local parts store and have them both tested for free. Check your battery and alternator wiring for cleanlkiness and security. Get your battery charged and replace your alternator and your Jeep will be fine again.
X2
Do not remove the battery on a newer running vehicle. This can cause voltage spikes that can fry expensive parts very quickly.
g.mccormick is offline   Reply With Quote
Old 12-09-2009, 05:15 PM   #4
Newbie
 
Join Date: May 2009
Posts: 1

View UserID6095's Photo Album My Photos
Cherokee
Default

Just went through the same issue. New Alt and belt she is good to go.

A freebie is check and make sure the belt is not slipping.
UserID6095 is offline   Reply With Quote
Old 12-09-2009, 05:31 PM   #5
Newbie
 
Join Date: Dec 2009
Posts: 4

View PatQuinn's Photo Album My Photos
Cherokee
Default

thanks guys
PatQuinn is offline   Reply With Quote
Old 12-09-2009, 05:43 PM   #6
Newbie
 
Join Date: Dec 2009
Posts: 4

View PatQuinn's Photo Album My Photos
Cherokee
Default

before i buy an alternator, is that the only thing that could be the problem? theres a brand new battery in there. could it be something with the wiring?


and also what is the easiest way to remove/install the alternator.? through the bottom or take out the battery tray?

Last edited by PatQuinn; 12-09-2009 at 05:48 PM.
PatQuinn is offline   Reply With Quote
Old 12-09-2009, 06:10 PM   #7
CF Veteran
 
BuckB91XJ's Avatar
 
Join Date: Nov 2008
Location: Oak Harbor, WA.
Posts: 6,972

View BuckB91XJ's Photo Album My Photos
1987 Cherokee
Default

Yes, you should inspect the battery cables at both ends and the alternator wiring and connectors. Bad wiring or connections can definitely cause this problem, too. That is why I said to do that in my message above.
__________________
Brian "Buck" Buchanan, U.S. Navy Chief Petty Officer (RETIRED) - 87 XJ Laredo - 8.5" Rusty's Offroad/Rough Country lift, D30 trussed up and D44 high clearance shock mounts, 4.56's, Aussies and Disc Brakes front and rear, JCR Offroad Belly Skid Plate and Stage 2 Rock Sliders, Off Road Fab Winch Bumper and Quarter panel Guards, Liberal Front Wheel Well trimming and Rear Wheel Well Cut N Fold, 35" Goodyear MTR with Kevlars, Cobra CB and AW4 First Gear Lock Crawl switch, SYE, Stock XJ driveshafts front and rear and Milemarker SEC8000 Winch.

91 XJ Sport (Old Gray Jeep) - Layed to Rest (04-01-13)
87 XJ Laredo (Ole Red) - (My Jeep)
87 XJ Base (The Boys Jeep)
96 XJ Country (The Daughters Jeep)
08 Dodge Charger R/T (The Wifes Ride)
04 Silverado 2500HD Duramax/Allison (tow rig)
BuckB91XJ is offline   Reply With Quote
Old 12-09-2009, 07:20 PM   #8
Newbie
 
Join Date: Dec 2009
Location: GA
Posts: 1

View CountryGoth's Photo Album My Photos
1986 Cherokee
Default

Quote:
Originally Posted by PatQuinn View Post
hey guys my 98 jeep cherokee keeps losing power. it will start up at about 12 volts and run ok (kind of rough) but as soon as i put on the headlights and/or radio the voltage drops down to 0. If i disconnect the battery while the car is running it cuts power immediately. Does this mean it is the alternator? Also 2 of the 4 bolts on the bottom of the alternator that connect the black peice with the green wire are broken off. could this be the problem? Thanks in advance.

If you disconnect the positive terminal while the car is running, and the car continues to run then the alternator is good. If the car cuts off then the alternator is bad.
CountryGoth is offline   Reply With Quote
Old 12-09-2009, 07:23 PM   #9
Newbie
 
Join Date: May 2009
Posts: 1

View UserID6095's Photo Album My Photos
Cherokee
Default

Quote:
Originally Posted by CountryGoth View Post
If you disconnect the positive terminal while the car is running, and the car continues to run then the alternator is good. If the car cuts off then the alternator is bad.

Sure if you want to replace the ECM and many more electronic components. You will fry something.

Last edited by UserID6095; 12-09-2009 at 07:28 PM. Reason: spellenz
UserID6095 is offline   Reply With Quote
Old 12-09-2009, 08:05 PM   #10
CF Veteran
 
96Cherokee113's Avatar
 
Join Date: Nov 2009
Location: New Jersey
Posts: 1,261

View 96Cherokee113's Photo Album My Photos
1996 Cherokee
Default

Your best bet would be to change the alternator. Similar problems when mine went and it took about an hour and a half to do...that time includes those hard to get off bolts, the occasional break, etc. It's not a bad job. When you get it unbolted it takes a little experimentation to get it out but if you jack up the engine a little it should slide out pretty easy. I got mine rebuilt for $80 and it works great.
96Cherokee113 is offline   Reply With Quote
Old 12-09-2009, 08:05 PM
 
 
 
submit to reddit
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
help!!! electrical problem gstewart OEM Cherokee Tech 22 12-07-2009 04:50 AM
alternator wiring problem old Alt plug new Alt 4 posts Diggler22 OEM Cherokee Tech 5 06-10-2009 03:06 PM
Electrical problem gjo69 Grand Cherokee Tech 0 06-02-2009 10:33 PM
Electrical Problem USMCXJ OEM Cherokee Tech 3 05-20-2009 12:59 AM
electrical problem grizzlypaugh OEM Cherokee Tech 13 02-24-2009 09:04 AM

Go Back   Jeep Cherokee Forum > Technical Discussion > OEM Cherokee Tech



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 11:58 PM.


This site is in no way affiliated with Jeep or Chrysler.

Emails Backup