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 273 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

47.

ONE FRONT MARKER LAMP NOT WORKING (FRONT TURN SIGNAL LAMP OK) (Continued).

NOTE

With positive lead connected to circuit 30-BR, check ground with negative lead

when doing the following checks.

6.

Check for voltage at

12-volts dc

Install bulb

Repair circuit

circuit 30-BR terminal

nominal.

(para 3-92),

30-BR (para

of lamp socket.

and go to step

3-127). Install

7.

bulb (para

3-92). Install

headlamp assem-

bly (para

3-91).

7.

Check for voltage at

12-volts dc Go to step 8.

Install head-

circuit 99-WH terminal

nominal.

lamp assembly

of ground point at

(para 3-91).

junction block.

8.

Check for voltage at

12-volts dc

Replace bulb

Repair circuit

circuit 99-WH terminal

nominal.

(para 3-92).

99-WH (para

of lamp socket.

Install

3-127). Replace

headlamp

bulb (para

assembly

3-92). Install

(para 3-91).

headlamp

Marker lamp

assembly (para

circuit OK.

3-91).

2-148