NEW BATTERY NEW ALTERNATOR 105 AMP INSTALLED, BATTERY LIGHT IS ON DOES NOT CHARG on 2001 Chevrolet Express 2500

BATTERY LIGHT CAME ON AND OFF BEFORE THE NEW PARTS, BATT. LIGHT STAYS ON NOW NOT CHARGING

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1 answer
Check for power at the large red wire on alternator if no power check for blown main fuse link.On your Chevy the gray and smaller red wire are controlled by the power train computer to operate the alternator.