ELECTRICAL TROUBLESHOOTING - continued - TM-9-2320-386-24-1-10103

TM 9-2320-386-24-1-1

0012 00

Electrical Troubleshooting (Contd)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 2. Connect negative lead of multimeter to frame ground.

Step 3. Touch positive lead to pin B of solenoid.

a. If voltage is present, go to test 2.

b. If voltage is not present, go to step 4.

Step 4. Remove lead 26 connected to pin A of air horn solenoid. Connect negative lead to frame

ground. Touch positive lead to contact end of lead 26.

a. If voltage is present, replace air horn solenoid (WP 0119 00).

b. If voltage is not present, replace or repair lead 26.

Test 2. Test horn switch input voltage.

Step 1. Remove horn button (TM 9-2320-361-20) until lead 25 can be seen.

Step 2. Set multimeter to voltage range that will measure 24 Vdc.

Step 3. Connect negative lead to frame ground.

Step 4. Touch positive lead to lead 25 contact end.

a. If voltage is not present, replace or repair lead 25 (WP 0125 00).

b. If voltage is present, go to test 3.

Test 3. Test horn switch continuity.

Step 1. Disconnect lead 25 from air horn solenoid to protect multimeter.

Step 2. Install horn button cap, spring, and contact (TM 9-2320-361-20).

Step 3. Set multimeter to RX1 scale.

Step 4. Connect negative lead to a good frame ground.

Step 5. Touch positive lead to lead 25 and press down until contact touches base plate.

a. If continuity is present, reconnect lead 25 and recheck horn operation.

b. If continuity is not present, remove horn button and clean or replace horn button

(TM 9-2320-361-20).

END OF TESTING!

ELECTRICAL ACCESSORIES

23. WINDSHIELD WIPERS FAIL TO WORK ON HIGH OR LOW SETTING

Test 1. Check mechanical linkage for binding or interference. Replace damaged linkage

Test 2. Test for voltage at wiper switch.

Step 1. Disconnect harness from wiper switch.

Step 2. Set multimeter to a voltage range that will measure 24 Vdc.

Step 3. Place accessory/battery switch to ON position.

Step 4. Touch negative lead of multimeter to ground and positive lead to lead 27 of harness

receptacle.

a. If voltage is present, go to test 3.

b. If voltage is not present, perform step 2, test 5 to check operation of

accessory/battery switch.