new rebuilt alternator problem
Thread Starter
Pro
Joined: Sep 2003
Posts: 670
Likes: 1
From: charlotte nc
new rebuilt alternator problem
I just installed a rebuilt alternator (CS 130 from a 93) in my 86 coupe . Reason for the change was bad bearings in the old one. The new one charges fine at lower RPM but voltage drops below 12 at ~ 3000 RPM. Does anyone know what causes this , Is it a bad voltage regulator? Thanks for your help on this. I'm stumped. :cheers:
[Modified by dwestsr, 2:09 AM 2/9/2004]
[Modified by dwestsr, 2:09 AM 2/9/2004]
Thread Starter
Pro
Joined: Sep 2003
Posts: 670
Likes: 1
From: charlotte nc
Re: new rebuilt alternator problem (dwestsr) Update
Hey folks , this is a rally strange one. I drove the car ~4 hours today and the alt was putting out 14.2 volts as long as I drove normally. Whenever I got on it the Voltmeter dropped to battery volts. Came back to normal when I resumed cruise speed. I just finished a rebuild on my spare alt. just in case, cause I don't trust this one. Should I try to figure this out or just get it replaced under warranty? Need some help!!! :cheers:
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Re: new rebuilt alternator problem (dwestsr)
You have a defective alternator, take it back. That alternator has out of round slip rings which at high rpm lift the brushes and turn off the field current shutting off the alternator.
