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 392 of 926

TM 9-2320-283-20-1

TOUBLESHOOTING.

2-11. TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

82.

ELECTRICAL HORN NOT WORKING.

NOTE

Blackout toggle switch must be set to NORMAL position when doing the following

checks.

1.

Remove circuit breaker

bracket far enough to

access circuit breaker

CB-5 (para 3-114), and

go to step 2.

2.

Check for voltage at

12-volts dc

Go to step 3.

Reset circuit

circuit 35-LG or 42-LG

nominal.

breaker CB-5

terminal of circuit

and/or trouble-

breaker CB-5.

shoot CB-5

circuit.

(Refer

to malfunction

34).

3.

Check for voltage at

12-volts dc

Go to step 4.

Repair circuit

circuit 35-LG terminal

nominal.

35-LG (para

of blackout toggle

3-127).

Install

switch.

circuit breaker

bracket (para

3-114).

4.

Remove relay RY-1 (para

3-112), and go to step

5.

2-266