Alternators - PRESTOLITE: Description

Three-phase, self-rectifying type using six diodes for rectification and an isolation diode (mounted on positive heat sink within alternator) to control operation of charge indicator lamp, to connect voltage regulator to alternator and battery when alternator is operating, and to prevent battery discharge through alternator windings when engine is not operating (maximum discharge is less than I milli-ampere). A 75 ohm resistor (in regulator) is connected in parallel with indicator light circuit to provide current for alternator field build-up in case of indicator light failure.