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 384 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).

10

Remove relay RY-4

(para 3-112), and go

to step 11.

11

Check for voltage at 12-volts dc

Install relay

Repair circuit

circuit 99X-BK of

nominal

RY-4 (para

99X-BK (para

relay connector

3-112), and go

3-127) Install

to step 12

relays

RY-4

and

RY-5, relay

connector, and

circuit breaker

bracket (para

3-112 and

3-114).

12

Check for voltage at 12-volts dc

Go to step 13

Repair circuit

circuit 99V-BK ter-

nominal

99V-BK (para

minal of relay

3-127) Install

connector

relay RY-5,

relay connec-

tor, and cir-

cuit breaker

bracket (para

3-112 and

3-114).

13

Check for voltage at 24-volts dc

Go to step 14

Reset circuit

circuit 18A-TN of

nominal

breaker CB-8

circuit breaker CB-8

and/or trouble-

shoot CB-2

circuit (Refer

to malfunction

35).

2-258