Charging System: Description and Operation

The alternator generates an AC voltage in its windings as it is belt-driven by the engine. The rectifier converts this AC voltage to DC.

The voltage regulator, a component which is included in the alternator frame, has a primary function of controlling the alternator's output to meet electrical system requirements. This regulator controls the charge warning light.


Fuse 7 supplies battery voltage to the charge warning light. With the engine not running and the ignition switch in ON, the charge warning light is grounded through fuse 5 and the normally closed contacts of the charge relay and the light is turned on. With the engine running and the alternator charging, terminal L voltage rises and applies voltage to the charge relay coil. The contacts open and the charge warning light goes out. If the alternator fails to charge, terminal L grounds internally and the charge relay coil deenergizes. The contacts close and the charge warning light comes on to indicate the malfunction.