Where is the voltage regulator on a 1991 montero?

On a 1991 Mitsubishi Montero, the voltage regulator is typically integrated into the alternator. To access it, you'll need to remove the alternator from the engine bay. Once the alternator is out, you can check the regulator, which may be mounted on the back of the alternator or be part of the alternator assembly. Always consult the vehicle's service manual for specific instructions and safety precautions.