Generator & Regulator: Description

Bosch conventional 3-phase, self-rectifying type generators use 3 exciter diodes connected to stator windings. These diodes turn off generator indicator light and supply power to voltage regulator while engine is running. Bosch voltage regulators are transistorized and integral with generator.

An unloader relay is used on some models. With ignition on and engine off, the relay receives battery voltage (B+) through fuse No. 28 and is grounded through terminal D+ of the generator. The relay energizes and switches ground to some accessories. When the engine is running and the generator begins to charge, battery positive voltage is also applied to terminal D+ to switch off the relay.