Lucas Ballast Resistors control the current in the ignition system once the vehicle has started, prolonging the lifespan of the ignition components.
Limits the amount of current in the ignition system once the vehicle is started. Allows 12v at cranking/start-up and then limits to between 6-9v when running to prolong the life of the ignition system.
Causes of Failure:
Wear and Tear, Vibration, Heat Damage