Gauge - Battery or Alternator? -

LinkBack Thread Tools
post #1 of 4 Old 05-22-2001, 06:08 PM Thread Starter
Registered User
Join Date: May 2001
Location: North Carolina
Posts: 10
Gauge - Battery or Alternator?

Hope this is not a stupid question, but does the system's electrical gauge measure the level of charge in the battery or what the alternator is putting out? I just noticed the gauge has dropped to just above the red zone at 8 volts.


ncmts is offline  
Sponsored Links
post #2 of 4 Old 05-23-2001, 09:03 AM
Registered User
Join Date: Mar 2001
Location: Michigan
Posts: 471
I believe it measures the total voltage available, from the battery and what is supplied by the alternator. If your reading 8 volts then either the alternator is not putting anything out or the battery is shot. Try disconnecting the alternator wiring harness and check the guage again. Also, watch the gauge when turning on all electrical accessories.

89' YJ - 4.2 - NV4500 - NP231w/sye - 1" Body Lift - 2 1/2" Rancho Suspension Lift - 31" Firestone MTR - AR Outlaw II - Tomken Bumpers F & R - Warn 8000 front - Warn 6000 rec. mount rear - FlowFit Seats - Tom Woods Rear & Custom 2" front driveshafts
FLHT_FXRS_YJ is offline  
post #3 of 4 Old 05-23-2001, 10:20 PM Thread Starter
Registered User
Join Date: May 2001
Location: North Carolina
Posts: 10
Thanks FLHT_FXRS_YJ. That sounds like a good idea to isolate the problem.

ncmts is offline  
post #4 of 4 Old 05-25-2001, 04:09 PM
JF Administrator, eh?
NaeKid's Avatar
1988 YJ Wrangler 
Join Date: Nov 2000
Location: Calgary, AB
Posts: 6,879
I am having a similar issue with my 88 YJ .. the voltage looks good for a while, drops to 1/2 voltage .. and finally drops off the guage .. then pops back up again. I have replaced my alternator and battery .. and no change. I am starting to think it might be a busted up wire or something .. everything else seems to be acting mostly normal.


Hello, my name is Vance and I am a Jeepaholic.
Its better to be naked with your friends, than to be clothed with your enemies
Silver 2006 TJ Unlimited, zombie ready as the daily-driver

- - - - - - -TEOTWAWKI- - - - - - -
NaeKid is offline  

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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
YJ losing battery juice while running-battery/alternator good Dannyboy6292 YJ Wrangler Technical Forum 20 01-13-2010 11:54 AM
bad alternator or battery? 91yjeeper TJ Wrangler Technical Forum 13 07-30-2009 10:17 AM
reading 0 on gauge volt battery gauge alecmcmahon TJ Wrangler Technical Forum 13 04-19-2009 03:43 PM
Battery or Alternator? machinehead131 YJ Wrangler Technical Forum 21 11-26-2008 12:45 PM
New battery + working alternator = battery still won't charge pyro9862 YJ Wrangler Technical Forum 7 10-28-2007 08:51 PM

Posting Rules  
You may post new threads
You may 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 On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome