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 63 of 926
TM 9-2320-283-20-1
PRINCIPLES OF OPERATION.
1-15.
ELECTRICAL SYSTEM (Continued).
c.
Service Lighting System (Continued).
(4)
Backup Lamps.
BLACKOUT TOGGLE SWITCH.
Two-position switch for NORMAL and BLACKOUT modes of operation.
In this circuit,
the switch is used to prevent operation of the backup lamp.
In BLACKOUT position, 12-volt power from circuit breaker
CB-5 passes through toggle switch and energizes coil of relay RY-7, thus
TA 236774
1-43
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