New External Voltage regulator buzzing and Gen light on above idling - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

 
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post #1 of 2 (permalink) Old Dec 3rd, 15, 1:38 PM Thread Starter
mike
 
Join Date: Oct 2007
Location: Bay Area
Posts: 18
New External Voltage regulator buzzing and Gen light on above idling

I had an issue where my external voltage regulator on my 64 chevelle burned up one of the coils and failed. I traced the issue back to the hot lead wire from the alternator shorting out on the fender, wearing through the wire insulator over time. I fixed the wiring and ensured none of the other wires were burned. I put in the new external voltage regulator, ensured it had a good ground and even grounded it to the battery. When I started the car and let it idle it is fine, when I rev the engine up the voltage regulator buzzes and my Gen light comes on. I went and got another voltage regulator just to see if maybe I had a bad one and the second new one does the same thing.
I have not replaced the alternator, which is my next step to have it tested. Could the alternator be bad too even though it seems to be putting out power?
Battery has 13.2 - 13.7 volts

The four prong connector is tight on the regulator, I also let the ar run for a couple of minutes with the lights on after I installed the regulator. Any ideas?
blacufo is offline  
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post #2 of 2 (permalink) Old Dec 4th, 15, 12:18 PM
Tech Team
 
Join Date: Apr 2015
Posts: 55
New External Voltage regulator buzzing and Gen light on above idling

Quote:
Originally Posted by blacufo View Post
I had an issue where my external voltage regulator on my 64 chevelle burned up one of the coils and failed. I traced the issue back to the hot lead wire from the alternator shorting out on the fender, wearing through the wire insulator over time. I fixed the wiring and ensured none of the other wires were burned. I put in the new external voltage regulator, ensured it had a good ground and even grounded it to the battery. When I started the car and let it idle it is fine, when I rev the engine up the voltage regulator buzzes and my Gen light comes on. I went and got another voltage regulator just to see if maybe I had a bad one and the second new one does the same thing.

I have not replaced the alternator, which is my next step to have it tested. Could the alternator be bad too even though it seems to be putting out power?

Battery has 13.2 - 13.7 volts



The four prong connector is tight on the regulator, I also let the ar run for a couple of minutes with the lights on after I installed the regulator. Any ideas?

Battery should be around 14-14.5v with the car started so your alternator could have a bad diode and could cause your GEN light to come on. The VR715 voltage regulator from AutoZone or your local auto parts store is electronic and works good because some mechanical regulators points begin to stick causing issues. Once you replace your regulator then replace your alternator and if your wiring is correct then you will have no problems.


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Jmerritt150 is offline  
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