Altinater/ampmeter???? - 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 03-27-2001, 09:05 PM
Posts: n/a

When I crank my engine the ampmeter reads negative 15 or so and the voltmeter reads about 11 volts. This seems normal to me. But once the engine is runing the they stay at these positions untill I rev. the engine to about 2000 then both needles jump at the same time. The ampmeter goes to positive 10 and the voltage goes to 14 volts. when the engine returns to idle they stay at the new readings.

Is this normal and Does anyone Know why it is happening.


Sponsored Links
post #2 of (permalink) Old 03-27-2001, 09:11 PM
Join Date: Dec 2000
Posts: 242
Thanks: 0
Thanked 0 Times in 0 Posts
Re: Altinater/ampmeter????

Are the meters you are using part of the Jeep, or external meters? The alternator belt may be lose, the bearings might be hindering the usual readings. There is also the possibility of the diode trio being faulty, and therefore allowing the current to run the wrong way. That one is a really long shot in the dark though. i would check the belt or the gauges first.

Scott Reuben
1979 CJ: 304 3spd, tires, rust, miles
1989 XJ: has seen every state except Hawaii

In search of lost paths and distant locations...
MyRide is offline  
post #3 of (permalink) Old 03-28-2001, 07:55 PM
Posts: n/a
Re: Altinater/ampmeter????

I don't remember the details because I just glanced over the article I read last week on alternators. The article mentioned single wire alternators which must be "excited" by reving the engine to a certain rpm before it would start charging. My guess, and only a guess would be that whatever component the single wire alternators leave out is malfuntioning on your alternator (or you have one of these single wire alternators). If I find the article I'll provide more info.

89YJ, 350, TH350, 33x12.50 BFG AT/KO, empty wallet
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