HORN WILL NOT SOUND.

TM 5-2420-224-20-1

Table 3-5. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

ELECTRICAL SYSTEM (CONT)

33.

HORN WILL NOT SOUND.

NOTE

Vehicle MASTER disconnect switch must be ON, master light switch set to SER

DRIVE, and horn button depressed. Failure to do so will cause erroneous results.

Refer to wiring diagram for ail wiring repair steps.

Step 1.

Check for +24 VDC between wire 641 (1) and ground at horn (2).

If +24 VDC is present, replace horn (page 4-218).

If +24 VDC is not present, go to step 2.

Disconnect connector F (3) and check for +24 VDC between wire 641 (1)

Step 2.

and ground.

If +24 VDC is present, repair wiring 641 between connector F

and horn.

If +24 VDC is not present, reconnect connector F and go to

step 3.

Remove two clamps (4) and intake pipe (5).

Step 3.

Step 4.

Loosen two captive screws (6) and pull bracket (7) out enough to gain

access to area behind bracket.

Step 5.

Disconnect connector AD (8) and check for +24 VDC between wire 641 (1)

and ground.

If +24 VDC is present, repair wiring 641 between connector AD

and connector F.

If +24 VDC is not present, go to step 6.

With connector AD (8) disconnected, check for +24 VDC between wire 64

Step 6.

(9) and ground at connector AD.

If +24 VDC is present, replace horn, low beam/high beam

switch (page 4-215).

If +24 VDC is not present, reconnect connector AD and go to

step 7.

Step 7.

Check for +24 VDC between wire 64 (9) and ground at fuse box 1 (10).

If +24 VDC is not present, replace fuse.

If +24 VDC is present, repair wiring 64 between fuse box 1

and horn, low beam/high beam switch.