ELECTRICAL TROUBLESHOOTING - continued - TM-9-2320-386-24-1-10102

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

0012 00

Electrical Troubleshooting (Contd)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

21. TRANSMISSION TEMPERATURE GAUGE INOPERATIVE

NOTE

If STE/ICE-R is available, perform NG31 Gauge Test (WP 0017 00).

Test 1. Test transmission temperature gauge voltage.

Step 1. Remove transmission oil temperature gauge (WP 0096 00).

Step 2. Place accessory/battery switch to ON position.

Step 3. Set multimeter to a voltage range that will measure 24 Vdc.

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

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

b. If voltage is not present, perform malfunction 2, test 5 for battery voltage at

accessory/battery switch.

Test 2. Test continuity of transmission oil temperature gauge.

Step 1. Set multimeter to measure continuity.

Step 2. Touch leads of multimeter to pins A and B of transmission oil temperature gauge.

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

b. Replace transmission oil temperature gauge if continuity is not present

Test 3. Test temperature sending unit.

Step 1. Remove cab tunnel to expose transmission oil temperature sending unit (WP 0117 00).

Step 2. Allow transmission fluid to cool.

Step 3. Start engine (TM 9-2320-386-10).

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

temperature switch. Multimeter reading should increase as transmission fluid

temperature increases.

a. If reading increases, perform test 4.

b. Replace transmission oil temperature sending unit if reading does not increase

Test 4. Check continuity of lead 324.

Step 1. Set multimeter to measure continuity.

Step 2. Touch negative lead of multimeter to transmission temperature sending unit end of

lead 324. Touch positive lead of multimeter to transmission temperature gauge end of

lead 324.

a. If continuity is not present, replace or repair lead 324 (WP 0125 00).

b. If continuity is present, replace transmission temperature gauge (WP 0096 00).

END OF TESTING!

22. HORN DOES NOT OPERATE

NOTE

Electrical troubleshooting of the electric horn or air horn is the same.

Test 1. Test air horn solenoid voltage.

Step 1. Remove lead 25 from pin B of air horn solenoid.