TM 9-2320-272-24-1
Table 2-3. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
21. REAR LIGHTS INOPERATIVE
Test rear lamp connector voltage.
Step 1. Place battery switch to OFF position.
CAUTION
Lead 15 or wire 15 is hot whenever the batteries are connected.
Step 2. Disconnect lead wire corresponding to inoperative rear lamp.
Step 3. Place battery switch to ON position.
Step 4. Place light switch to position corresponding to disconnected lead wire.
NOTE
For stoplight lead test, brake pedal must be depressed and air
pressure maintained.
Step 5. Set multimeter to 50-volt range.
Step 6. Connect multimeter negative lead to vehicle chassis ground and positive lead to
disconnected lead wire. Light switch must be in the corresponding position. Note voltage
indication.
a. If voltage was indicated, replace bulb (para. 3-118). If new bulb fails to operate,
perform malfunction 16, test 2.
b. If battery voltage is not indicated, perform malfunction 16, test 4.
2-132
