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 240 of 855

TM 9-2350-277-20-1

HORN DOES NOT WORK

0037 00

INITIAL SETUP:

Maintenance Level

Unit

Tools and Special Tools

General Mechanic’s Tool Kit (WP 0926 00, Item 65)

Multimeter (WP 0926 00, Item 30)

Jumper wire

Personnel Required

Mechanic

Helper (H)

Equipment Condition

Engine stopped (TM 9-2350-277-10)

Carrier blocked (TM 9-2350-277-10)

Power plant rear access panels removed (WP 0439 00)

T

1.

Remove lead 10863474 plug (1) from horn jack (2).

2.

Measure resistance between lead 10863474 plug (1) and ground.

3.

Does multimeter read 0 ohms?

TN

1.

Replace lead 10863474 and/or

connector (WP 0382 00).

2.

Verify no faults found.

Y

1.

Remove harness 8763491 circuit 25 plug (1) from horn jack (2).

2.

Move MASTER POWER switch to ON.

3.

Measure voltage between harness 8763491 circuit 25 plug

(1) and ground with horn button depressed.

4.

Does multimeter read less than 17 volts?

YN

1.

Replace horn (WP 0336 00).

2.

Verify no faults found.

003700-1

Change 5