TM 9-2320-289-20
Table 2-4. Electrical Troubleshooting (Con’t)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
36. BLACKOUT DRIVE LIGHT INOPERATIVE (OTHER BLACKOUT LIGHTS OPERATE)
Step 1.
Ensure that blackout drive light switch is in “ON” position.
Step 2.
Remove and check blackout drive light bulb. (See paragraph 4-25)
If bulb is good, trace circuit to switch. (See wiring diagram F-18 or F-19)
Replace bulb if burned out.
Step 3.
Check for voltage at white lead on 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)
37. HAZARD WARNING LIGHTS INOPERATIVE (TURN SIGNALS OPERATE)
Step 1.
Remove hazard warning flasher. (See paragraph 4-12) Using jumper wire, connect
fuse box terminals where flasher was installed. Lights should turn on, but not flash.
If lights turn on, replace flasher.
If lights do not turn on, trace circuit. (See wiring diagram F-13 or F-16)
38. STOPLIGHTS (BOTH) INOPERATIVE (HEADLIGHTS OPERATE)
Step 1.
Check 10 amp stoplight fuse. (See paragraph 4-12)
Replace fuse if burned out.
Step 2.
Remove and check stoplight bulbs. (See paragraph 4-28 or 4-29)
Replace bulbs if burned out.
Step 3.
Check for voltage at orange lead on stoplight switch.
If there is voltage, perform step 4.
If there is no voltage, trace circuit. (See wiring diagram F-14, F-15, or F-17)
Step 4.
With brake pedal depressed, check for voltage at white/black lead on stoplight
switch.
Adjust switch for proper contact. (See paragraph 4-16, INSTALLATION) If
there is still no voltage, trace circuit. (See wiring diagram F-14, F-15 or
F-17)
If there is voltage, replace switch. (See paragraph 4-19)
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