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 329 of 926

TM 9-2320-283-20-1

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

68. BOTH 12-VOLT TRAILER STOPLAMPS NOT WORKING.

NOTE

Blackout toggle switch must be set to NORMAL

position,

air

system

pressurized to 105 psi, and brake pedal

depressed by assistant when doing the following checks.

1.

Disconnect 12-volt

trailer connector, and

go to step 2.

2.

Check for voltage at

12-volts dc

Recheck trailer

Refer to

circuit 36E-DG and

nominal.

stoplamp circuit.

Malfunction

37E-YL (pins 3 and 5

56.

of connector).

69. ONE 12-VOLT TRAILER STOPLAMP NOT WORKING.

NOTE

•-Blackout toggle switch must be set to

NORMAL position, air system pressurized to

105 psi, and brake pedal depressed by

assistant when doing the following checks.

•·It is assumed here that chassis stoplamp

circuit is OK.

Faulty right trailer stoplamp is

shown in this procedure.

Apply similar

troubleshooting

technique

for

left

trailer

stoplamp.

2-204