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THEORY OF OPERATION
E-4 E-4
CLASSIC® 300D & 300G
BATTERY, STARTER, ENGINE,
ALTERNATOR & PROTECTION
CIRCUITS
The 12VDC battery powers the starter motor and,
through the ignition switch, the engine protection cir-
cuitry. In the event of a low oil pressure or a high
coolant temperature condition, the engine protection
system shuts the engine off.
The idle / engine protection PC board or, the engine
control unit (ECU) monitors the oil pressure sensor,
and the coolant temperature sensor. If either sensor “
faults,” the engine is shut down.
The engine alternator supplies “charging” current for
the battery circuit. If the alternator would cease to func-
tion correctly, due to a broken fan belt or other mal-
function, the engine protection system would shut the
engine down.
FIGURE E.4 - BATTERY, STARTER, ENGINE, ALTERNATOR & PROTECTION CIRCUITS
(Classic® 300G, Zenith Fuel System/GM Engine)
NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion
+
-
ZENITH
E.C.U.
B
ATTERY
STARTER
MOTOR
START
AMMETER
IGNITION
SWITCH
E
NGINE
A
LTERNATOR
ENGINE FAILURE LAMP
HOUR METER
FUEL PUMP
IDLE
SWITCH
ENGINE
RPM CONTROL
GASOLINE
ENGINE
ENGINE
C
ONTROL
COMPONENTS
A
ND
SENSORS
N
EGATIVE
O
UTPUT
TERMINAL
P
OSITIVE
O
UTPUT
TERMINAL
CURRENT
S
ENSOR
P.C. BOARD
115 & 230VAC
RECEPTACLES
SELECTOR
SWITCH
G
ENERATOR
F
RAME
A
LTERNATOR STATOR
ROTATOR
FIELD
RECTIFIER
GENERATOR
F
IELD CONTROL
RHEOSTAT
FLASHING
SLIP
R
INGS
A
RMATURE
SHAFT
SERIES
C
OILS
FIELD
SHUNT
W
INDINGS
RESIDUAL
M
AGNETISM
I
NTERPOLE
COILS
GENERATOR
ARMATURE
M
ECHANICAL
COUPLING
BRUSHES
&
COMMUTATOR
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