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 382 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

81.

24-VOLT TRAILER BLACKOUT TAILLAMPS NOT WORKING (Continued).

6

Remove relay RY-2 (para

3-112), and go to step

7.

7

Check for voltage at 12-volts dc

Install relay

Repair circuit

circuit 99Z-BK terminal

nominal

RY-2 (para

99Z-BK (para

of relay connector

3-112), and go

3-127) Install

to step 8

relays

RY-2

and

RY-5, relay

connector, and

circuit breaker

bracket (para

3-112 and

3-114).

8

Remove relay RY-3 (para

3-112), and go to step

9.

9

Check for voltage at 12-volts dc

Install relay

Repair circuit

circuit 99Y-BK terminal

nominal

RY-3 (para

99Y-BK (para

of relay connector

3-112), and go

3-127) Install

to step 10

relays

RY-3

and

RY-5, relay

connector, and

circuit breaker

bracket (para

3-112 and

3-114).

2-256