CHEVROLET ALTERNATOR

My Battery Not Charging Light Came On The Other Day. Had The Truck Taken Into A Shop Where They Tested The Battery And Alternator Putting...

I Need To Replace The Alternator

When Cold, My Alternator Charges Around 14.5 To 14.9 Volts. When Everything Warms Up, It Drops To About 13 Volts. Is This Normal...