Where is the Voltage Regulator at on a 1998 Chevy Malibu?

The voltage regulator on a 1998 Chevy Malibu is integrated into the alternator. Unlike older vehicles where it was a separate component, in this model year, the voltage regulation is handled internally within the alternator itself. Therefore, you won't find a separate voltage regulator. If you're having charging issues, the alternator itself is the likely culprit.