TM 9-2320-260-20
Table 2-4. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3. Touch negative lead of multimeter to trailer receptacle pin D.
Step 4. Touch positive lead to appropriate trailer receptacle pin of circuit being tested. Light
switch must be in corresponding position.
a. Battery voltage should be present at trailer receptacle being tested.
b. If battery voltage is present, disconnect and reconnect male connector to ensure
positive connection. If trailer lamps still do not light, check male connection for
corrosion. If trailer lamps still do not light, check trailer lighting system.
c. If battery voltage is not present at one or more of the pins being tested, go to test 2.
Test 2. Test trailer receptacle ground.
Step 1. Set multimeter to RX1 scale.
Step 2. Touch negative lead of multimeter to frame ground.
Step 3. Touch positive lead of multimeter to pin D of trailer receptacle. Continuity should be
present.
a. Repair or replace harness if continuity is present (para. 4-52).
b. Repair or replace lead 90 if continuity is not present (para. 4-52).
END OF TESTING!
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