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Old 03-15-2017, 11:32 PM   #1
RED72blazer
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buzzing external voltage regulator 72 K5 blazer

Alright, in my 1972 blazer recently my charging system was overcharging. I traced it to a bad regulator. Replaced it. It charges fine. But there is a loud buzzing coming from my new regulator. Figured it was a bad new part. Replaced it. Still buzzing. Went to another brand. Still buzzing. So now just because. I changed the alternator. Still buzzing. Then I got a 80 dollar ac Delco regulator. Still buzzing. Today I cleaned all the grounds. Still buzzing. Anyone have any ideas on what is going on? This is getting tiresome. I do have a new wiring harness from M&H. I've had zero problems in 10 years or more with the stock system. I do not want to go to a 1 wire alternator or internal regulator. I just want the stock system to work. Any help would be great. Thanks
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Old 03-15-2017, 11:52 PM   #2
VetteVet
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Re: buzzing external voltage regulator 72 K5 blazer

Do you have the regulator grounded to the sheet metal and to the alternator?
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Old 03-15-2017, 11:57 PM   #3
RED72blazer
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Re: buzzing external voltage regulator 72 K5 blazer

Quote:
Originally Posted by VetteVet View Post
Do you have the regulator grounded to the sheet metal and to the alternator?
The alternator and the regulator both have the "factory" grounds installed. I even ran a temporary wire between the 2. No difference.
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Old 03-16-2017, 12:24 AM   #4
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Re: buzzing external voltage regulator 72 K5 blazer

Are you hearing the buzzing in the regulator or in the cab with the radio on. The condenser on the VR must be hooked up or you will hear the buzzing in the radio.

Here are some threads on the buzzing that might solve your problem.
https://www.google.com/search?domain...D%3A1%3B&hl=en
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Old 03-16-2017, 12:30 AM   #5
RED72blazer
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Re: buzzing external voltage regulator 72 K5 blazer

No radio installed currently. It's definitely the regulator. You can feel it if you put your hand on it.
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Old 03-16-2017, 12:06 PM   #6
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Re: buzzing external voltage regulator 72 K5 blazer

The buzzing is caused by the points in the regulator opening and closing at a very rapid rate more than normal probably due to the voltage sensing circuit for the alternator. This would be the blue wire to the alternator and the red wire from the regulator to the soldered junction. Or you may have just gotten another bad regulator.

Silly question: did you re-install the regulator using the little rubber washers? I know, but I have to ask.

A very good option would be the solid state regulator made by Wells which is sold at Napa and Autozone PN. VR 715 for pre 73 GM vehicles. Here is a good thread on another forum about it.

http://www.chevelles.com/forums/45-c...-60s-cars.html
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Old 03-16-2017, 05:40 PM   #7
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Re: buzzing external voltage regulator 72 K5 blazer

............

http://www.autozone.com/batteries-st...e&newYmme=true
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