TM 9-2320-260-20
Table 2-4. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Test 6. Test wiring harness for floodlights ground.
Step 1. Disconnect ground leads W3-3, W3-4, and W3-5 for floodlights.
Step 2. Set multimeter to RX1 scale.
Step 3. Disconnect lead W3 connector.
Step 4. Touch positive lead of multimeter to contact end of lead W3-3.
Step 5. Touch negative lead of multimeter to contact end of connector at lead W3. Continuity
should be present.
Step 6. Repeat steps 4 and 5 for leads W3-4 and W3-5.
a. If continuity is present, go to step 7.
b. Repair or replace lead if continuity is not present (para. 4-52 or 4-53).
Step 7. Disconnect two leads 87 at floodlight switch (pins A and D).
Step 8. Disconnect lead 87 at connector.
Step 9. Touch positive lead of multimeter to contact end of lead 87 at connector.
Step 10. Touch negative lead of multimeter to lead 87 at floodlight switch (pins A and D).
Continuity should be present.
Step 11. Repeat steps 9 and 10 for lead 87 at floodlight switch (pins B and C). Continuity should
be present.
a. If continuity is present, go to step 12.
b. Repair or replace lead 87 if continuity is not present (para. 4-52 or 4-53).
Step 12. Touch positive lead of multimeter to contact end of lead W4/87 going to ring collector.
Step 13. Touch negative lead of multimeter to lead W1 from ring collector. Continuity should be
present.
a. If continuity is present, go to test 7.
b. If continuity is not present, notify next higher level maintenance.
Step 14. Disconnect ground lead (W6- 1) connector.
Step 15. Touch positive lead of multimeter to contact end of ground lead (W6- 1) going to ring
collector.
Step 16. Touch negative lead of multimeter to contact end of lead W3 from ring collector.
Continuity should be present.
a. If continuity is present, go to test 7.
b. If continuity is not present, notify your supervisor.
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