2-44. HEADLAMPS AND TAIL LAMPS (Continued).
24-VOLT TRAILER RECEPTACLE (M915, M916, M917, and M920). Tractor chassis
mounted 12-pin connector to provide power to Iunette-towed vehicles. (This receptacle
is 12-volts on the M917).
HIGH-BEAM INDICATOR. When power is supplied to each high-beam filament in the
headlamps, the high-beam indicator is illuminated via the same circuit.
DIMMER SWITCH. Two-position, floor-mounted switch. The switch is always closed in
one of two positions to energize either the low-beam or high-beam filament.
HEADLAMP SWITCH. Three-position with one OFF position and two ON positions,
When the switch is pulled out to the second detented ON position, 12-volt power is
supplied to the lighting systems through operation lamp switch. (The first detented position
on the switch energizes the circuit for tail lamps, but not the headlamps.) The switch has an
integral circuit breaker that opens to protect the complete circuit in the event of a short
or faulty wiring. The circuit breaker is a recycling type; that is, it opens when the circuit
is overloaded and cycles until the fault is removed.
24-VOLT TRAILER RECEPTACLE (M915, M916, and M920). Tractor chassis mounted
12-pin connector, provides 24 volts to trailer for lighting and tail lamps.
12-VOLT TRAILER RECEPTACLE (M915, M916, and M920. Tractor mounted seven-
pin connector provides 12 volts to trailer for lighting.