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 - Page 222 of 1207

TM 9-2320-361-20

Table 2-4. Electrical Troubleshooting (Contd).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Test 2. Test input voltage to manifold heater switch.

Step 1. Disconnect lead 55 at switch input.

Step 2. Turn accessory/ignition switch to ON position.

Step 3. Connect negative lead of multimeter to frame ground.

Step 4. Touch positive lead of multimeter to contact end of lead 55.

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

b. If battery voltage is not present, go to malfunction 4, test 6.

Test 3. Test continuity of manifold heater switch.

Step 1. Turn accessory/ignition switch to OFF position.

Step 2. Disconnect lead 55 to manifold heater switch output.

Step 3. Set multimeter to RX1 scale.

Step 4. Connect negative lead to one side of switch and touch positive lead to other side. Push

manifold heater switch.

a. If continuity is not present, replace manifold heater switch (para. 4-22).

b. If continuity is present, go to test 4.

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