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 70 of 926
TM 9-2320-283-20-1
PRINCIPLES OF OPERATION.
1-15.
ELECTRICAL SYSTEM (Continued).
d.
Blackout Lighting System (Continued).
CIRCUIT BREAKER (CB-8).
Protects electrical components of 24-volt blackout taillamp relay circuit by opening when load
exceeds 20 amperes.
May be manually reset by pressing CB-8 button in.
HEADLAMP
SWITCH.
Has one OFF position and two ON positions.
Supplies 12-volt power to the blackout toggle
switch.
CIRCUIT BREAKER (CB-9).
Protects electrical
components of 24-volt blackout stoplamp relay circuit by opening when
load exceeds 20 amperes.
May be manually reset by pressing CB-9 button in.
24-VOLT TRAILER CONNECTOR.
Cab mounted 12-pin connector to provide 24-volt power to trailers for blackout
taillamps and stoplamps.
REAR BLACKOUT LAMPS.
Contains bulbs
for blackout taillamps and stoplamps.
Black out taillamp is energized when
the blackout toggle switch is in BLACKOUT position and the headlamp switch is in either ON position.
Stoplamps are
energized when the stoplamp switch is actuated.
24-VOLT TRAILER
CONNECTOR.
Chassis mounted 12-pin connector to provide 24-volt power to trailer blackout
taillamps and stoplamps.
STOP LAMP SWITCH.
Part of the brake system.
Shown and described in paragraph 1-20b.
In this circuit, the switch
receives 12-volt power from
circuit breaker CB-1.
When
the
brakes are engaged, switch closes and supplies 12-volt
power through the blackout toggle switch to energize relay RY-4.
With this relay closed, 24-volt power is supplied through
circuit breaker CB-9 to the 24-volt tractor mounted trailer connector.
1-50
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