TM 9-2320-260-20
Table 2-4. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
24. 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 volts.
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. Voltage should be present.
a. If voltage is present, go to test 2.
b. If voltage is not present, go to malfunction 15, 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 volts.
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. Voltage should be present.
Replace stoplight switch if voltage is not present (para. 4-25).
END OF TESTING!
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