TM-9-2350-261-20-1

CARRIER, M113A2, M577A2, M1064, M1068, M1059 AND M901A1

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL - VOLUME 1 OF 4

TM-9-2350-261-20-1 - Page 249 of 346

TM 9-2350-261-20-1

HORN DOES NOT OPERATE — Continued

0037 00

4Y

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?

4YN

1.

Install right headlight wiring

harnessplugtofrontmainharness

jack at fire wall.

2.

Install horn ground lead plug

to horn jack.

3.

Install right headlight wiring harness

circuit25plugontohornjack

.

4.

Replace horn switch (WP 0252 00).

5.

Verify no faults found.

5Y

1.

Remove jumper wire from right headlight wiring

harness circuit 25.

2.

Install circuit 25 plug on horn jack.

3.

Install a jumper wire between horn switch plug (1), circuit

25 pin (2), and ground.

4.

Measure resistance between front main harness jack

(3), pin A (4), and ground.

5.

Does multimeter read 0 ohms?

5YN

1.

Remove jumper wire from horn

switch plug.

2.

Repair front main harness circuit

25 (WP 0312 00).

3.

Verify no faults found.

003700-4