Battery/Alternator Issues - JeepForum.com
 
LinkBack Thread Tools
post #1 of 5 Old 11-21-2013, 06:59 AM Thread Starter
BotchedRepair
Registered User
1981 CJ7 
 
Join Date: Sep 2013
Location: Charlotte
Posts: 18
Battery/Alternator Issues

Hi All,

A few weeks ago, I replaced my battery and alternator ('81 CJ7 with a '76 304 AMC). I had to go back in and tighten the belt and negative connector on the alternator because it wasn't producing enough voltage to keep the battery charged. That seemed to fix the problem (the problem being a consistently dead battery). Yesterday, I saw a voltage drop on the battery and sure enough, it gave out on me again. Thinking it was a connection/tension issue that arose because of the temperature change here in Charlotte, NC, I tightened the belt again and assured the connections were solid. My volt meter is showing the alternator producing roughly 19 volts, but the battery continues to trickle down from 12 after jumped.

My question is this... What the heck could be the problem? Why would it have charged the battery fine for a few weeks, then suddenly crapped out? I feel like it is a connection issue, but I'm not sure where else to troubleshoot. Help!!

BotchedRepair is offline  
Sponsored Links
Advertisement
 
post #2 of 5 Old 11-21-2013, 07:47 AM
WindKnot
Registered User
1977 CJ7 
 
Join Date: Mar 2011
Posts: 3,676
I'm not so sure the alternator isn't doing its job. What you're describing sounds more like some sort of a parasitic drain.

What you might want to do if you have a VOM is open up each circuit one at a time and look for amperage. I'd almost bet there's one circuit that has a ground on it.

I'd rather be lost on the trails than found at home!

Phoenix Rising- A Flame Off Restoration? http://www.jeepforum.com/forum/f8/ph...ation-1807257/
WindKnot is offline  
post #3 of 5 Old 11-21-2013, 09:30 AM
LumpyGrits
Registered User
1985 CJ7 
 
Join Date: Jul 2010
Location: The Mojave Desert - Palmdale, Ca. U.S.A.
Posts: 5,885
Charge the battery and leave it disconnected over night.
Have a real load test done for amps/volts.
Think'n you battery has issues.
X2 on patristic drain in your system.
Lets eliminate the battery as a fault.
Then go have your alt. tested.
Check ALL engine/frame/body gnds.
LG

Have'n you along, is like loose'n 2 good men
LumpyGrits is offline  
post #4 of 5 Old 11-23-2013, 11:08 PM Thread Starter
BotchedRepair
Registered User
1981 CJ7 
 
Join Date: Sep 2013
Location: Charlotte
Posts: 18
I spent the better part of today messing around with the circuit. I tested numerous potentials for drain and it turned out that the voltage regulator was the problem. Thanks to you all for your great insight!!!
BotchedRepair is offline  
post #5 of 5 Old 11-24-2013, 11:06 AM
JeepHammer
Running On Empty...
1973 CJ5 
 
Join Date: Aug 2007
Location: South West Indiana
Posts: 11,175
19 volts is a dead giveaway the voltage regulator is shot!
You should NEVER see more than 14.5 volts at any given time for any reason.

China voltage regulators do that sometimes... They work OK for a little bit, then go nuts.

19 volts WILL damage the battery, have it tested! Get warranty if you can just to make sure you didn't cook/warp plates that will screw you later.
JeepHammer is offline  
Reply

Tags
alternator , battery , voltage drop

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









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



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