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 331 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

70.

BOTh 12-VOLT TRAILER TURN SIGNAL LAMPS NOT WORKING.

NOTE

Blackout toggle switch must be set to NORMAL position and

turn signal switch set to hazard position 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

Refer to mal-

circuit 36E-DG and

nominal.

trailer turn

function 53.

37E-YL (pins 3 and 5

signal lamp

of connector).

circuit.

71.

ONE 12-VOLT TRAILER TURN SIGNAL LAMP NOT WORKING.

NOTE

•

Blackout toggle switch must be set to NORMAL

position and turn signal switch set for right turn when doing

the following checks.

•

It is assumed here that chassis turn signal

lamp

circuit

is

OK.

Faulty right-side trailer turn signal lamp is

shown

in this

procedure.

Apply same troubleshooting

technique for left-side trailer turn signal lamp.

1.

Disconnect 12-volt

trailer connector, and

go to step 2.

2.

Check for voltage at

12-volts dc

Recheck trailer

Repair circuit

circuit 36E-DG (pin 5

nominal.

right turn

36E-DG (para

of connector).

signal lamp

3-127).

circuit.

2-206