ELECTRIC HORN DOES NOT WORK

TM 5-2420-222-20-1

ORGANIZATIONAL TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

25. PARKING BRAKE HORN ON LOADER BACKHOES WITH SERIAL NUMBERS 319995 THRU 342573 DOES NOT

WORK - CONTINUED

WARNING

Although ignition lock switch must be on and battery ground cable connected to test electrical circuit

voltage, turn off ignition lock switch and disconnect battery ground cable before doing resistance tests or

replacing parts. This will keep you from getting shocked and prevent damage to parts and equipment.

Step 4. Apply parking brake (TM 5-2420-222-10). Using multimeter set to RX1 scale, place red probe on parking

brake warning switch terminal (1) and black probe on parking brake warning switch terminal (2). Check for 0

ohm on multimeter.

a. If multimeter reads 0 ohm, repair orange wire in parking brake wiring harness (page 2-137).

b. If multimeter reads more than 0 ohm, adjust or replace parking brake warning switch (Serial

Numbers 319995 thru 342573 only) (page 2-482).

26. ELECTRIC HORN DOES NOT WORK

WARNING

Although Ignition lock switch must be on and battery ground cable connected to test electrical circuit

voltage, turn off ignition lock switch and disconnect battery ground cable before doing resistance tests or

replacing parts. This will keep you from getting shocked and prevent damage to parts and equipment.

Step 1. Check to see if electric horn (3) and bracket (4) are tightly mounted.

a. If horn (3) and bracket (4) are tightly mounted, go to step 2.

b. If horn (3) is loose, turn clockwise until tight.

c. If bracket (4) is loose, tighten screw (5) using 9/16-inch open-end wrench.

2-98