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58
TM 9-2320-312-24-2
Systems Operation Section
Both the low amperage circuit and the charging
circuit are connected to the same side of the
NOTICE
ammeter. The starting circuit is connected to the
When boost starting an engine, the instructions in Sys-
opposite side of the ammeter.
tems Operation, "Engine Starting" should be followed
in order to properly start the engine.
NOTICE
This engine may be equipped with a 12 volt starting
Never operate the alternator without the battery in the
system or a 24 volt starting system. Only equal voltage
circuit. Making or breaking an alternator connection
for boost starting should be used. The use of a higher
with heavy load on the circuit can cause damage to
voltage will damage the electrical system.
the regulator.
The Electronic Control Module (ECM) must be dis-
connected at the "J1/P1" and "J2/P2" locations before
welding on the vehicle.
Engine Electrical System
The electrical system has three separate circuits:
Charging circuit
Starting circuit
Low amperage circuit
Some of the electrical system components are used
in more than one circuit. The following components
are used in each of the three circuits:
Battery
Circuit breaker
Battery cables
The charging circuit is in operation when the engine
is running. An alternator generates electricity for the
charging circuit. A voltage regulator in the circuit
controls the electrical output in order to keep the
battery at full charge.
NOTICE
The disconnect switch, if equipped, must be in the ON
position in order to let the electrical system function.
There will be damage to some of the charging circuit
components if the engine is running with the discon-
nect switch in the OFF position.
If the vehicle has a disconnect switch, the starting
circuit can operate only after the disconnect switch
is put in the ON position.
The starting circuit is in operation only when the
start switch is activated.

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