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 267 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

44.

HEADLAMP SWITCH NOT WORKING.

1

Check for voltage at

12-volts dc

Go to step 2

Refer to mal-

circuit 10-RD terminal

nominal

function 18.

of battery.

2

Disconnect circuit

O1B-RD from 10OC-RD at

engine harness con-

nector, and go to step

3.

3

Check for voltage at

12-volts dc

Connect circuit

Repair circuit

circuit 1OB-RD

nominal

1OB-RD to

10B-RD and/or

10C-RD, and go

10-RD (para

to step 4

3-127).

4

Check for voltage at

12-volts dc

Go to step 5

Repair circuit

circuit 1OC-RD terminal

nominal

IOC-PK (para

of circuit breaker

3-127).

CB-1.

5

Check for voltage at

12-volts dc

Replace head-

Repair circuit

circuit 1OD-PK terminal

nominal

lamp switch

1OD-PK (para

of headlamp switch

(para 3-78)

3-127).

TA 236879

2-142

TM 9-2320-283-20-1

TROUBLESHOOTING.