* Alternator failure: The alternator itself might be bad, needing replacement. This is the most common cause.
* Alternator belt broken or slipping: The belt that drives the alternator could be broken, loose, or worn out, preventing the alternator from spinning and generating power.
* Wiring problems: A problem in the wiring between the alternator, battery, and the light itself could be preventing the circuit from working correctly. This could include a bad ground connection.
* Voltage regulator issues (if applicable): Older alternators sometimes had separate voltage regulators; a faulty regulator could prevent proper charging. The '72 Nova may or may not have a separate regulator depending on the alternator's design.
If the GEN light is on, your battery is draining and will eventually die, leaving you stranded. You should have the alternator and its associated components checked by a mechanic as soon as possible. Ignoring it could lead to costly repairs later on.
