1. Internal Voltage Regulator Failure: The voltage regulator is a component of the alternator that controls the output voltage. If the voltage regulator fails, it may not be able to properly control the voltage, resulting in no voltage on the alternator line.
2. Open Circuit in the Alternator: An open circuit in the alternator can also cause no voltage on the alternator line. This could be due to a damaged wire, loose connection, or a failed alternator winding.
