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 388 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

81.

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

18

Check for voltage at 24-volts dc

Install RY-5

Repair circuit

circuit 18E-TN of

nominal

(para 3-112),

18E-TN (para

circuit breaker CB-8

and go to step

3-127) Install

19

19

RY-5, relay

connector, and

circuit breaker

bracket (para

3-112 and

3-114).

19

Move blackout toggle

Listen for

Install relay

Replace relay

switch from BLACKOUT

clicking

connector and

RY-5

Install

to NORMAL and back to

sounds at

circuit breaker

relay connector

BLACKOUT position relay RY-5

bracket (para

and circuit

3-112 and

breaker

bracket

3-114), and go

(para

3-112

and

to step 20

3-114).

20

Disconnect circuit

23G-BR from 23J-BR at

connector, and go to

step 21.

21

Check for voltage at 24-volts dc

Connect circuit

Repair circuit

circuit 23G-BR (pin J nominal

23G-BR to

23G-BR (para

of connector)

23J-BR, and go

3-127).

to step 22.

2-262