Sounds like the voltage regulator is starting to fail.

If you are not comfortable with replacing the regulator and brushes yourself (~$60) then paying $150 for a lifetime reman'd is a good idea.
You also get all new bearings as well.

I have always had good luck with Worldwide products. I know Autozone carries that brand.


2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.