TM 9-2320-260-20
Table 2-4. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
16. FRONT MARKER LAMP DOES NOT UGHT
Test 1. Test battery voltage at front composite light.
Step 1. Turn auxiliary light switch lever to OFF position.
Step 2. Disconnect lead 491 at rear of front composite light on side of vehicle where lamp has
failed.
Step 3. Turn auxiliary light switch to PARK position.
Step 4. Set multimeter to a range that will measure 24 volts.
Step 5. Check for battery voltage on contact end of lead 491.
a. If battery voltage is present, go to test 2.
b. If battery voltage is not present, go to malfunction 15, test 3 and test lighting system
harness connector pin L.
Test 2. Test continuity of filament in front marker lamp.
Set multimeter to RXl scale. Check continuity between frame ground and lead 491 connected to
front composite light.
a. Replace marker lamp if continuity is not present (para. 4-40).
b. If continuity is present, check for corroded contacts at lamp and lead 491 connection
to front wiring harness. Connect lead 491.
END OF TESTING!
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