TM 9-2320-289-20
Table 2-4. Electrical Troubleshooting (Con’t)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3.
Disconnect lead from back-up light switch. Using jumper wire, connect terminals of
wiring harness lead.
If lights turn on, replace switch. (See paragraph 4-19)
If lights do not turn on, trace circuit. (See wiring diagram F-14, F-15, or F-17)
33. HEADLIGHTS INOPERATIVE IN HIGH AND LOW BEAM (ALL OTHER LIGHTS OPERATE)
NOTE
It may be necessary to remove headlights to perform this step.
Step 1.
Check for voltage at headlight connectors.
If there is voltage, replace headlights. (See paragraph 4-24)
If there is no voltage, trace circuit from headlight connectors to blackout
toggle switch. (See wiring diagram F-1 3 or F-16)
34. ALL PARKING/MARKER LIGHTS INOPERATIVE (HEADLIGHTS OPERATE)
Step 1.
Check 20 amp parking/marker light fuse. (See paragraph 4-12)
Replace fuse if burned out.
Step 2.
Trace circuit from marker light connectors. (See wiring diagram F-13 or F-16)
35. BLACKOUT LIGHTS INOPERATIVE
Step 1.
Ensure that blackout toggle switch is in “ON” position and blackout drive light
switch is in “ON” position.
Step 2.
Check 5 amp blackout marker
fuse and 10 amp stoplight fuse. (See
paragraph 4-12)
Replace fuse if burned out.
Step 3.
Turn key to “RUN” position. Check for voltage at orange lead on blackout toggle
switch connector.
If there is voltage, replace switch. (See paragraph 4-18)
If there is no voltage, trace circuit. (See wiring diagram F-18 or F-19)
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