A car regulator is typically associated with the vehicle's electrical system, specifically the alternator. The regulator's primary function is to control the electrical output of the alternator to ensure the battery is properly charged and the electrical system operates within a safe voltage range.

The regulator can be either:

1.⁠ ⁠Internal: Built into the alternator assembly.

2.⁠ ⁠External: A separate component connected to the alternator.