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 201 of 1207

TM 9-2320-361-20

Table 2-4. Electrical Troubleshooting (Contd).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

26. ALL STOPLIGHTS ARE INOPERATIVE

Test 1. Check stoplight switch for input voltage.

Step 1. Turn main light switch to SERVICE DRIVE position.

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

Step 3. Disconnect lead 75 input voltage from stoplight switch.

Step 4. Touch positive lead of multimeter to contact end of lead 75.

Step 5. Touch negative lead of multimeter to frame ground.

a. Voltage should be present. If voltage is present, go to test 2.

b. If voltage is not present, go to malfunction 17, test 3, depress brake pedal, and check

pin A.

Test 2. Check stoplight switch for output voltage.

Step 1. Set multimeter to a voltage range that will measure 24 Vdc.

Step 2. Disconnect output lead 75 from stoplight switch.

Step 3. Touch positive lead of multimeter to contact end of stoplight switch.

Step 4. Touch negative lead of multimeter to frame ground.

Step 5. Depress brake pedal.

NOTE

If vehicle is equipped with hydraulic stoplight switch and switch is

defective, replace with air-activated stoplight switch conversion kit,

part number 12255668.

If voltage is not present, replace stoplight switch (para. 4-29).

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