Alternator test - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 09-23-2001, 08:44 AM
Posts: n/a
Alternator test

CAn I test my alternator while its mounted on the Jeep? I thought of connecting my volt meter to the positive terminal, but wondered about the battery's affect? What's the deal?


Sponsored Links
post #2 of (permalink) Old 09-23-2001, 09:01 AM
Old Hand
Join Date: May 2000
Location: Raleigh, NC
Posts: 535
Thanks: 0
Thanked 0 Times in 0 Posts
Re: Alternator test

A volt meter will tell you if its dead as a doornail as they say.. but it won't test if it can actually put out any amps. The auto parts stores around here (autozone, advance) will test them in the vehicle, for free.

83 CJ-7 and 76 CJ-7 with stuff
sloop is offline  
post #3 of (permalink) Old 09-23-2001, 09:08 AM
Way Outta Control
Join Date: Sep 1999
Location: The Palouse
Posts: 13,432
Thanks: 1
Thanked 3 Times in 3 Posts
Re: Alternator test

The autoparts store will put the alternator in a "Growler." This will not only test the output, but the regulator (if internally regulated) but the bearings as well. The tester should vary the speed of the spin. This will test the bearings. All in all, take the time to remove the alternator and have it tested... then you know what's right, and what's wrong.

LEVE is offline  
Sponsored Links
post #4 of (permalink) Old 09-23-2001, 10:19 AM
Join Date: Dec 1999
Posts: 5,140
Thanks: 0
Thanked 0 Times in 0 Posts
Re: Alternator test

a simple check with your meter ( if its digital)
is to check voltage across the bat terminals with the key turned off.

then check again with the engine running, it should be higher with the engine running, around 14.4 volts


I love the U.S.A.
ozarkjeep is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Off-Road Forums & Discussion Groups 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 email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

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 On
Pingbacks are On
Refbacks are On

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