Cadillac & LaSalle Club Discussion Forum

Cadillac & LaSalle Club Forums => Technical / Authenticity => Topic started by: 2danreed on October 25, 2019, 05:22:32 PM

Title: Voltage regulator trouble?
Post by: 2danreed on October 25, 2019, 05:22:32 PM
I just replaced the alternator and voltage regulator on my "64 Cadillac. Everything seems to be charging correctly (12 volts at bat. with car off, 13-14 volts when the car is running) Odd problem is that the volt. reg. is causing the GEN light to come on while driving at certain rpms, it blinks on as I slow to a stop. Then blinks on again as I take off from a stop, but stays off while cruising speed. Then when I park and turn the car off the GEN light comes on! I can only get it to go off if I disconnect the four wire plug on the voltage regulator. What's the deal?
Title: Re: Voltage regulator trouble?
Post by: Bobby B on October 25, 2019, 07:26:42 PM
Maybe the VR needs to be adjusted? "New" Alternator could have a bad diode or dead spot once it heats up. All this stuff is from China now and the quality of the rectifiers are terrible. They will trash a computer in a modern car.
                                                                                                     Bobby
Title: Re: Voltage regulator trouble?
Post by: z3skybolt on October 25, 2019, 10:54:26 PM
might want to check with Brillman. I bought a high quality made in the USA regulator and other parts from them. Mine was $96.00.  Not cheap but good quality. Working perfectly after 500 miles.

https://brillman.com/?gclid=EAIaIQobChMI7PKWyfW45QIVah6tBh1qqwETEAAYASAAEgL6BPD_BwE

Bob R.
Title: Re: Voltage regulator trouble?
Post by: 2danreed on October 28, 2019, 03:18:40 PM
Thanks guys.  I decided to go with an upgrade to an internally regulated 3-wire alternator. That did the trick. Its charging correctly and the GEN light comes on only momentarily at startup and goes out when running and when the car is turned off. That external regulator must have been the culprit.