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 361 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

79.

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

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 ter-

nominal

RY-3 (para

99Y-BK (para

minal of relay RY-3

3-112), and go

3-127) Install

to step 10

relays

RY-6

and

RY-3, relay

connector, and

circuit breaker

bracket (para

3-112 and

3-114).

10

Remove relay RY-4

(para 3-112), and go

to step 11.

11

Check for voltage at 12-volts dc

Go to step 12

Repair circuit

circuit 99X-BK ter-

nominal

99X-BK (para

minal of relay RY-4

3-127) Install

RY-6, relay

connector, and

circuit breaker

bracket (para

3-112 and

3-114).

2-236