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 396 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11. TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

82.

ELECTRICAL HORN NOT WORKING (Continued).

10. Install relay RY-1

(para 3-112), and go

to step 11.

11. Disconnect horn (para

3-117), and go to step

12.

12. Move blackout toggle

Listen for

Install circuit

Replace relay

switch from NORMAL to

clicking

breaker bracket

RY-1.

Install

BLACKOUT and back to

sound at

(para 3-114),

circuit breaker

NORMAL position.

relay RY-1.

and go to step

bracket (para

13.

3-112 and

3-114).

Connect

horn (para

3-117).

13. Disconnect circuit

41-WH from 41A-WH at

connector, and go to

step 14.

14. Check for voltage at

12-volts dc

Connect engine

Repair circuit

circuit 41-WH (pin 17

nominal.

harness con-

41-WH (para

of connector).

nector, and go

3-127).

Connect

to step 15.

horn (para

3-117).

15. Check for voltage at

12-volts dc

Replace horn

Repair circuit

circuit 41A-WH ter-

nominal.

(para 3-117).

41A-WH (para

minal of horn.

3-127).

2-270