TM 9-2320-260-20
Table 2-4. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
27. ONE OR MORE FLOODLIGHTS DO NOT OPERATE
Test 1. Test battery and ignition switch.
Step 1. Position battery switch to ON position.
Step 2. Position ignition switch to RUN position.
Step 3. Turn ignition switch to START and release. Engine should crank.
a. If engine cranks, go to test 2.
b. If engine fails to crank, go to malfunction 1, Battery System.
Test 2. Test floodlights connection voltage.
Step 1. Check for loose connections at floodlights wiring harness and broken floodlights.
Step 2. Position battery switch to ON position and ignition switch to RUN position.
Step 3. Disconnect two leads behind malfunctioning floodlight.
W 1-2 voltage input
a. Boom floodlights:
W 3-3 ground
W 1-3 voltage input
b. Tank floodlights:
W 3-4 ground
c. Gondola floodlight: W1-4 voltage input
W3-5 ground
Step 4. Position floodlight switch to ON position.
Step 5. Set multimeter to a range that will measure 24 volts.
Step 6. Touch positive lead of multimeter to contact end of voltage input lead.
Step 7. Touch negative lead of multimeter to contact end of ground lead. Voltage should be
present.
a. Replace floodlight if voltage is present (para. 4-42).
b. If voltage is not present, go to test 3.
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