TM-9-2320-283-20-1
TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1
TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE PART 1 OF 3
DECEMBER 1983
TM-9-2320-283-20-1 - Page 74 of 926
TM 9-2320-283-20-1
PRINCIPLES OF OPERATION.
1-15.
ELECTRICAL SYSTEM (Continued).
e.
Relays, Circuit Breakers, and Diode.
ENGINE TEMPERATURE DIODE.
Provides a circuit to illuminate engine temperature indicator when engine is cranking.
Prevents engagement of starter by feedback voltage when water temperature switch closes.
CIRCUIT
BREAKER
(CB-9).
Protects
24-volt blackout stoplamp, marker, and taillamp circuits for trailers used with the
M915A1.
CIRCUIT
BREAKER (CB-8).
Protects 24-volt left and right turn signals and blackout taillamp circuits for trailers used with
the M915A1.
CIRCUIT BREAKER
(CB-7).
Protects 12-volt headlamp and operational lamp switch circuit.
CIRCUIT BREAKER (CB-6).
Protects 12-volt cigar lighter circuit and 12-volt utility outlets.
CIRCUIT BREAKER (CB-5).
Protects 12-volt electric horn and turn signal flasher circuits.
CIRCUIT BREAKER (CB-4).
Protects 12-volt heater fan motor circuit.
CIRCUIT BREAKER (CB-3).
Protects 12-volt backup lamps, ether start, and defroster fan circuits.
CIRCUIT BREAKER (CB-2).
Protects 12-volt engine retarder brake, moisture ejection valve heater, air dryer heater,
instrument gages, low air, park brake, and differential lockout circuits.
CIRCUIT BREAKER (CB-1).
Protects 12-volt stoplamp, blackout toggle switch, turn signal, dome lamp, map lamps, and
instrument lighting circuits.
1-54
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