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 216 of 1207

TM 9-2320-361-20

Table 2-4. Electrical Troubleshooting (Contd).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

35. FRONT WHEEL DRIVE INDICATOR LIGHT INOPERATIVE

Test 1. Test lamp.

Step 1. Disconnect lead 27A from indicator lamp.

Step 2. Set multimeter to RX1.

Step 3. Touch positive lead of multimeter to input pin of indicator lamp and negative lead to frame

ground.

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

b. If continuity is not present, replace indicator lamp (para. 4-36).

Test 2. Test front wheel drive indicator lamp input voltage.

Step 1. Disconnect lead 27A from indicator lamp.

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

Step 3. Connect multimeter positive lead to 27A and negative lead to frame ground.

a. If voltage is present, reconnect and go to test 4.

b. If voltage is not present, go to test 3.

Test 3. Test input voltage to front wheel drive lock-in switch.

Step 1. Remove lead 27A from pin A of lock-in switch.

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

Step 3. Touch positive lead of multimeter to lead 27A. Voltage of 24 Vdc should be present.

a. If voltage is present, replace lock-in switch (para. 4-36).

b. If voltage is not present, replace or repair lead 27A (para. 4-51).

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