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 315 of 926

TM 9-2320-283-20-1

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

62. ONE BLACKOUT MARKER LAMP NOT WORKING (Continued).

3

Remove right headlamp

assembly (para 3-91),

and go to step 4.

4

Check for voltage at

12-volts dc

Install head-

Repair circuit

circuit 23C-TN of

nominal

lamp assembly

23C-TN (para

junction block

(para 3-91),

3-127).

Install

and go to step

headlamp assem-

3

bly (para

3-91).

5

Disconnect circuit

23-TN from right marker

lamp, and go to step 6.

6

Check for voltage at

12-volts dc

Go to step 7

Repair circuit

circuit 23-TN terminal

nominal

23-TN (para

of connector

3-127).

NOTE

With positive lead on circuit 23-TN, check ground with

negative lead when doing the following checks.

7

Remove bulb from right

marker lamp (para

3-94).

8

Check for voltage at

12-volts dc

Replace bulb

Clean socket

socket ground

nominal

(para 3-94),

connection,

and install

and install

lens (para

bulb (para

3-94)

3-94).

2-190