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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.

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