Where is the voltage regulator located on a 2004 Cadillac CTS?

In a 2004 Cadillac CTS, the voltage regulator is integrated into the alternator. To access it, you'll need to remove the alternator from the engine bay, which typically involves disconnecting the battery, removing the drive belt, and unbolting the alternator itself. Once the alternator is out, the voltage regulator can be accessed for testing or replacement.