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 60 of 926
TM 9-2320-283-20-1
PRINCIPLES OF OPERATION.
1-15.
ELECTRICAL SYSTEM (Continued).
c.
Service Lighting System (Continued).
(3)
Turn Signal and Hazard Warning Lamps (Continued).
INDICATOR LAMPS.
Three bulbs
to indicate
left turn (green),
right turn (green), or hazard (red).Bulbs are energized, by
selection, with 12-volt power from flasher unit.
HAZARD WARNING SWITCH.
When
engaged,
it
receives
12-volt power
from blackout toggle switch through flasher
and energizes all lights in the turn signal circuits at the same time.
RELAY (RY-2).
Normally open contacts are closed by 12-volt power from left turn signal
switch or
hazard warning
switch.
When relay
is energized,
24-volt power is supplied to tractor mounted connector for trailer left turn signals.
RELAY (RY-3).Normally open contacts are
closed by 12-volt power from right turn signal switch or hazard
warning
switch.
When relay is energized, 24-volt power is supplied to tractor mounted connector for trailer right turn signals.
12-VOLT
TRAILER
CONNECTOR.
Cab mounted seven-pin connector provides 12-volt power to the trailer turn signal
lamps.
24-VOLT TRAILER
CONNECTOR.
Chassis mounted 12-pin connector provides 24-volt power to the trailer turn signal
lamps.
24-VOLT TRAILER CONNECTOR.
Cab mounted 12-pin connector provides 24-volt power to vehicles.
REAR TAILLAMPS.
Each assembly contains two bulbs; the taillamp turn signal and stoplamp circuits use
the same
bulb.
When either
the turn
signal switch or hazard warning switch are on, the turn signal and stoplamp filaments flash.
When
the turn signal control is activated, only the bulb on the side selected flashes.
If the brakes are engaged at the
same time
that the hazard warning switch is on, both bulbs flash.
When the
brakes are engaged and the turn signal control is
activated, one bulb will flash and the other bulbs will remain on constantly.
MARKER
AND TURN
SIGNAL LAMP ASSEMBLY.
Each assembly has a replaceable single filament bulb that flashes
when turn signal switch or hazard warning signal is on.
1-40
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