2001 Chevy Silverado Ammeter Issues

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Please help with any suggestions... When I drive on the freeway and reach sppeed of 60+ MPH my ammeter/volt meter gauge drops and stops charging, then I reduce speed and it jumps back up again. At times the red batery lite on dash comes on then off. Only happens when I am on the freeway. Been driving for months with this issue and battery is still good and I'm still on the road. Help please!!

[silveradobobby]

Sounds like the voltage regulator is going out during higher and longer RPMs its overloading and shutting down I would replace the alt. But first make sure all your cables are good and tight and check those grounds!

[Zembonez]

Sounds like the voltage regulator is going out during higher and longer RPMs its overloading and shutting down I would replace the alt. But first make sure all your cables are good and tight and check those grounds!

^^^ What he said. The regulator is dying.

[Alljackedup408]