TM-9-2320-361-20

2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)

TECHNICAL MANUAL; UNIT MAINTENANCE

OCTOBER 1991
TM-9-2320-361-20

  TM-9-2320-361-20 - Page 209 of 1207

TM 9-2320-361-20
Table 2-4. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
31. FUEL GAGE INOPERATIVE
WARNING
Do not perform testing near fuel tank with fill cap or sending unit
removed. Fuel may ignite causing injury to personnel.
NOTE
Ensure fuel tank is not empty before proceeding to test 1.
If STE/ICE is available, perform NG31 - gage test (chapter 2,
section VII).
Test 1. Test for battery voltage to fuel level sending unit.
Step 1. Disconnect lead 28 from fuel level sending unit.
Step 2. Set multimeter to a voltage range that will measure 24 Vdc.
Step 3. Connect negative lead to frame ground and touch positive lead to contact end of lead 28.
a. If battery voltage is present, go to test 2.
b. If battery voltage is not present, go to test 3.
Test 2. Test fuel gage operation.
Step 1. Turn accessory/ignition switch to OFF position.
Step 2. With lead 28 already disconnected from sending unit, touch contact end to frame ground.
Step 3. Turn accessory/ignition switch to ON position.
Step 4. Fuel gage should read “EMPTY.”
a. If fuel gage shows “EMPTY,” go to step 5.
b. If fuel gage does not show “EMPTY”, replace fuel gage (para. 4-12).
Step 5. Lift lead 28 from frame ground. Fuel gage should now read “FULL.”
a. If fuel gage shows FULL, it is operational. Remove fuel level sending unit (para. 4-26)
and go to test 5.
b. If fuel gage does not show FULL, replace fuel gage (para. 4-12).
Test 3. Test fuel gage voltage.
Go to malfunction 29, test 2, and check battery voltage into fuel gage.
Test 4. Test continuity of lead 28.
Step 1. Turn accessory/ignition switch to OFF position.
Step 2. Disconnect lead 28 from fuel gage and from fuel level sending unit.
Step 3. Connect jumper wire from fuel level sending unit end of lead 28 to frame ground.
Step 4 Set multimeter to RX1 scale.
Step 5. Connect negative lead of multimeter to frame ground and touch positive lead of multimeter
to contact end of lead 28.
a. If continuity is present, reconnect lead 28 and recheck fuel gage operation.
b. If continuity is not present, replace or repair wiring (para. 4-51).
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