Alternator/ Charging System Test results - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today



Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 12-05-2012, 02:18 PM
Thread Starter
  #1
Jeeper
 
sc0tt's Avatar
 
Join Date: Jan 2011
Location: Centre County, Pennsylvania
Posts: 37
sc0tt is on a distinguished road
Alternator/ Charging System Test results

98 wrangler, 4.0-Been intermittently getting a check gauges warning light for a few months and when this happens the voltage gauge in the dash shows zero. Generally, it stays like this until the next time i start the Jeep. Then all appear well. The voltage indicator typically is just below 14 volts.

I had the charging system test at Advance Auto Parts last night and the only concern to the charging system indicated was 'Excessive Ripple' with a RIPPLE value indicated of 465mV and a wave diagram peaking and dipping between -.24V and +.24V. The No Load result was 13.92V & 7.1A. The Loaded result was 13.40V and 7.2A.

I admittedly don't know what any of this means, but the Advanced Auto guy said the fix was to replace the alternator. I want to make sure he's correct cause only time i've ever replaced an alternator was after it was no longer functioning at all and very obvious it had failed. A little bit of reading around the forum and i see the 98 Wranglers voltage is regulated with in the PCM. Can that be ruled out as the problem with this limited information? Is replacing the alternator the right fix? Let me know if I can provide any more information.

Something is in need of fixing, i'm just looking for a bit better degree of certainty i'm fixing the proper things.
Thanks.
__________________
=========================================
Th-th-th-th-that's all folks!
sc0tt is offline   Quote
Old 12-06-2012, 11:44 AM
Thread Starter
  #2
Jeeper
 
sc0tt's Avatar
 
Join Date: Jan 2011
Location: Centre County, Pennsylvania
Posts: 37
sc0tt is on a distinguished road
Anyone?

__________________
=========================================
Th-th-th-th-that's all folks!
sc0tt is offline   Quote
Old 12-06-2012, 12:22 PM   #3
Jeeper
 
UFOtestpilot's Avatar
 
Join Date: Nov 2012
Location: Portland, Oregon
Posts: 2,278
UFOtestpilot is on a distinguished road
13.8-14.8 is normal, so it appears on the light end of the scale. I'm not an electrics guy, but it seems that checking the cables and connections to ensure maximum continuity would be the first step for me. However, if someone said the brushes and/or windings on my alternator were shot I would have to give consideration to that possibly being the culprit/fix.
__________________
For some, it is easier to kill the light inside of themselves than it is to fight the darkness all around them.
UFOtestpilot is offline   Quote
 
Old 12-06-2012, 01:18 PM   #4
Jeeper
 
AC0QR's Avatar
 
Join Date: May 2011
Location: Reston, VA
Posts: 245
AC0QR is on a distinguished road
I am an electrics guy, and it sounds like your alternator either needs new brushes, or just needs to be replaced. I recommend replacing the alternator. Take the air filter box off first - makes access much easier.
__________________
Always Remember: Safety Third!
AC0QR is offline   Quote
Old 12-10-2012, 12:57 PM
Thread Starter
  #5
Jeeper
 
sc0tt's Avatar
 
Join Date: Jan 2011
Location: Centre County, Pennsylvania
Posts: 37
sc0tt is on a distinguished road
Thanks, i replaced the alternator yesterday, but in the process of removing the Alternator Harness/PLug from the old to be used with the new, two of the 4 connections that bolt/connect directly to the bottom of the alternator basicly just crumbled from corrosion. Looking for a replacement if anyone has any leads. Chrysler was a dead end.
__________________
=========================================
Th-th-th-th-that's all folks!
sc0tt is offline   Quote
Reply

Tags
alternator , ripple , voltage

Thread Tools

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 08:50 AM.


User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC
« Back

Enter your email address:

Delivered by FeedBurner