TM-9-2350-277-20-1

CARRIER M113A3, M577A3, M1059A3, M1064A3, M1068A3 AND M58

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL VOLUME 1 OF 6

TM-9-2350-277-20-1 - Page 241 of 855

TM 9-2350-277-20-1

HORN DOES NOT WORK — Continued

0037 00

2Y

1.

Release horn button.

2. (H)MoveMASTERPOWERswitchtoOFF

.

3.

Remove harness 8763491 plug (1) from harness 12349881

jack (2) at fire wall.

4.

Measure resistance between harness 8763491 plug (1),

pinA(3)tolead25(4)

.

5.

Does multimeter read 0 ohms?

2YN

1.

Replace wiring harness 8763491

circuit 25 (WP 0373 00).

2.

Verify no faults found.

3Y

1.

Remove circuit 25/25A plug (1) from horn switch jack (2).

2.

Measure resistance between horn switch jack pins (2)

with horn switch depressed.

3.

Does multimeter read 0 ohms?

3YN

1.

Install harness 8763491 plug to

harness 12349881 jack at fire wall.

2.

Install lead 10863474 plug to

horn jack.

3.

Install harness 8763491 circuit 25

plug onto horn jack.

4.

Replace horn switch (WP 0293 00).

5.

Verify no faults found.

003700-2

Change 5