Where is the voltage regulator for a 1991 Chevy 5.7?
The voltage regulator on a 1991 Chevy 5.7L (likely a TBI or small-block) is integrated into the alternator. There's no separate voltage regulator as a standalone component like on older vehicles. You won't find a separate box or unit. If you're having charging issues, the alternator itself needs to be tested or replaced.