SPONSORED LINKS

87 Monte Carlo altenator

Tiny
BOBALBERTYJR
  • MEMBER
  • 1987 CHEVROLET MONTE CARLO
Checking the altenator with a multimeter, I have 12.8 at the bat lug on the back of the alt. As well as the number two port, with or without the key on, have voltage at the number one port with key on only, but sometimes it is as low as 2 to 3 volts, or as high as 14.4 volts. With the car running on the fast idle solenoid it will continue to run with the battery disconnected, but as soon as you kick it off the fast idle solenoid it will die. Would this reflect a voltage regulator is going away, dont have the info to check the diode bridge or the rectifyer.
SPONSORED LINKS
Sunday, November 19th, 2006 AT 10:08 PM

1 Reply

Tiny
BACKYARDMECHANIC
  • MECHANIC
  • 337 POSTS
Your car has the voltage regulator built into the alternator, so if you change the alternator you also change the voltage reulator. You say you are getting 12.8 volts off the battery with the car running and no accessaries on. You should ge at least 13.2 (at a bare minimum) with the accessaries on and higher with nothing on. If you replace the alternator I think you will fix the problem.
Backyardmechanic
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Monday, November 20th, 2006 AT 1:54 PM

Please login or register to post a reply.

Related Alternator Voltage Regulator Content

Alternator Replacement
VIDEO
Alternator Replacement
Instructional repair video
Alternator Replacement
GUIDE
Alternator Replacement
Got a red battery warning light on? This most likely means the alternator has gone out and needs a replacement. To confirm the failure use a voltmeter to test the alternator...
VIEW MORE

Sponsored links