M151A2 60 AMP Generator voltage issue

[catamountinsp]

Good morning, Is there a way to reduce voltage on the 60 amp generator on the 151A2? My voltage gauge is beyond the green section and into the red a bit. My concern is that its causing issues with my gauges (fuel, oil, and Temp) not working. Thank you in advance.

 

[hambone]

Have you checked the voltage across the battery? check your voltage with the engine off then start it and check it with it running, should be about 28v when running. I would check the other gauges for a good ground.
There is a small allen head plug next to the terminal cover on the alternator that can be removed to adjust the voltage of the regulator. Remove the plug and use a small phillips head screwdriver to adjust the voltage to 28 volts with the engine running. The adjustment is opposite what you'd expect. Turning it counterclockwise increases the voltage and turning clockwise decreases it. Usually you will only need to move this 1/4 turn or less, may have to clean some goo out of the plug hole.

 

[catamountinsp]

Thanks B. !

 

[papakb]

Usually this is an indication of the voltage regulator failing. There is a small hex plug on the side of the alternator that gives you access to an adjusting pot for the voltage. The adjustment is backwards from what you expect, turning the pot clockwise decreases the voltage. They're available from the current manufacturer, Southern Automotive: https://southernautomotive.com/catalog/product_info.php/products_id/29

I also believe that Eriks Surplus has them available.