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BATTERY, STARTER, ENGINE
ALTERNATOR AND PROTECTION
CIRCUITRY (CLASSIC IIID)
The 12VDC battery powers the starter motor, glow
plugs and the engine protection circuitry. The fuel
pump and solenoid are powered from the protection cir-
cuit through the ignition switch. In the event of a low oil
pressure or high oil temperature condition, the engine
protection system will shut down the engine by remov-
ing power from the fuel solenoid and lift pump. If the
normally open oil pressure switch does not close, due
to low pressure or inadequate oil supply, the engine
alternator and automatic idler circuit will not function.
THEORY OF OPERATION
E-4 E-4
Classic III and IIID
FIGURE E.2b – BATTERY, STARTER, ENGINE ALTERNATOR AND
ENGINE PROTECTION CIRCUITRY (CLASSIC IIID)
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.