What causes the amp light to come on a 1964 Buick Riviera?

The amp light on a 1964 Buick Riviera typically indicates a problem with the electrical charging system. Common causes include a malfunctioning alternator or generator, a dead battery, or a fault in the wiring or connections. If the amp light comes on, it suggests that the vehicle is not generating enough electrical power to meet its demands, which can lead to battery drain and other electrical issues. It's advisable to check the charging system components for any faults or failures.