Circuit Description

Circuit Description
The generator generates AC voltage in its windings by a belt driven by the engine. The rectifier converts this AC voltage to DC voltage. The voltage regulator, a component which is included in the generator frame, has a primary function of controlling the generator's output to meet electrical system requirements. The regulator also controls the charge warning lamp. Fuse 2 supplies batten voltage to the charge warning indicator. With the engine if not running and the ignition switch in ON, terminal L of the regulator is grounded internally and the indicator lights up

A small amount of current provided by both the charge warning lamp and the pre-excitation resistor is used to "excite" the magnetic field windings to start the charging process. With the engine running and the generator charging, terminal L voltage rises and the indicator goes out. If the generator fails to charge, terminal L remains below battery voltage and the indicator remains lights.