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jax55 · 05-02-2018, 05:25 PM

If you look at the rear housing you will see a half moon shaped hole. There is a tab in that hole, if you ground that tab and the alternator charges.... bad regulator. Easy to replace.
Bill Williamson is correct, if you lose a diode there will be a definite sound. Still easy to replace.
Could also be you wore one of the brushes out.
All are easy to replace, once you have the parts.

05-02-2018, 05:25 PM	#10
jax55 Senior Member Join Date: May 2014 Location: Santa Barbara, Ca Posts: 329	Re: 12V Delco alternator problem If you look at the rear housing you will see a half moon shaped hole. There is a tab in that hole, if you ground that tab and the alternator charges.... bad regulator. Easy to replace. Bill Williamson is correct, if you lose a diode there will be a definite sound. Still easy to replace. Could also be you wore one of the brushes out. All are easy to replace, once you have the parts.