TM 9-2320-260-20
Table 2-4. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
20. FRONT BLACKOUT MARKER LAMP DOES NOT LIGHT
Test 1. Test battery voltage at front marker light.
Step 1. Turn main light switch to OFF position.
Step 2. Disconnect lead 20 at rear of front composite light on side of vehicle where light does not
light.
Step 3. Turn main light switch lever to BLACKOUT MARKER or BLACKOUT DRIVE position.
Step 4. Set multimeter to a range that will measure 24 volts.
Step 5. Check for battery voltage at contact end of lead 20.
a. If battery voltage is present, go to test 2.
b. If battery voltage is not present, go to malfunction 15, test 3 and check wiring
harness pin E.
Test 2. Test continuity of filament in blackout marker lamp.
Step 1. Set multimeter to RX1 scale.
Step 2. Check continuity between frame ground and lead 20 attached to rear of front composite
light.
a. Replace blackout marker lamp if continuity is not present (para. 4-40).
b. If continuity is present, check for corroded contacts at lamp and at lead 20 connection
to front wiring harness. Connect lead 20.
END OF TESTING!
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