TM 9-2320-272-24-1
Table 2-3. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
22. ONE OR MORE TRAILER LIGHTS INOPERATIVE
Test 1. Test trailer receptacle voltage.
Step 1. Place battery switch to ON position.
CAUTION
Lead 15 or wire 15 is hot whenever the batteries are connected.
Step 2. Place light switch to position corresponding to inoperative lamp.
NOTE
For stoplight lead test, brake pedal must be depressed and air
pressure maintained.
Step 3. Set multimeter to 50-volt range.
Step 4. Connect multimeter negative lead to socket terminal pin L on receptacle. Touch positive
lead to appropriate connector socket of lead being tested. Light switch must be in the
corresponding position.
a. Battery voltage should be indicated at connector socket being tested.
b. If voltage was not indicated at one or more of pins being tested, go to test 2.
c . If voltage is indicated, disconnect and reconnect male connector to ensure positive
connection. If trailer lamps still do not light, check male connection for corrosion.
d. If trailer lamps still do not light, check trailer lighting system.
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