TM-9-2320-272-10
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; OPERATOR'S MANUAL
SEPTEMBER 2004
CHANGE 2
TM-9-2320-272-10 - Page 73 of 481
TM 9-2320-272-10
1-56
1-19. ELECTRICAL SYSTEMS OPERATION (Contd)
h. Trailer and Semitrailer Connection System Operation.
The trailer receptacle is identical on all models covered in this manual. The
semitrailer receptacle is on the tractor body only.
B
SEMITRAILER RECEPTACLE
– M931/A1/A2 and M932/A1/A2 vehicles
equipped with a fifth wheel are provided with a semitrailer receptacle. This
receptacle provides vehicle lighting, auxiliary power, and a ground circuit for
semitrailers.
A
TRAILER RECEPTACLE
– Provides vehicle lighting, auxiliary power, and
a ground circuit for trailers.
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