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 363 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).

12

Remove relay RY-5

(para 3-112), and go

to step 13.

13

Check for voltage at 12-volts dc

Install relay

Repair circuit

circuit 99W-BK ter-

nominal

RY-5 (para

99W-BK (para

minal of relay RY-5

3-112), and go

3-127) Install

to step 14

relay RY-6 and

RY-5, relay

connector, and

circuit breaker

bracket (para

3-112 and

3-114).

14

Check for voltage at 24-volts dc

Go to step 15

Reset circuit

circuit 18B-GY ter-

nominal

breaker CB-9

minal of circuit

and/or trouble-

breaker CB-9

shoot CB-9

circuit (Refer

to malfunction

35).

15

Check for voltage at 24-volts dc

Install relay

Repair circuit

circuit 18B-GY ter-

nominal

RY-4 (para

18B-GY (para

minal of relay RY-4

3-112), and go

3-127).

to step 16.

16

Check for voltage at 24-volts dc

Go to step 17

Repair circuit

circuit 18C-GY ter-

nominal

18C-GY (para

minal of relay RY-6

3-127).

2-238