TM 9-2320-289-20Table 2-4. Electrical Troubleshooting (Con’t)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONStep 3.Disconnect lead from back-up light switch. Using jumper wire, connect terminals ofwiring 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)NOTEIt 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 blackouttoggle 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 INOPERATIVEStep 1.Ensure that blackout toggle switch is in “ON” position and blackout drive lightswitch is in “ON” position.Step 2.Check 5 amp blackout markerfuse and 10 amp stoplight fuse. (Seeparagraph 4-12)Replace fuse if burned out.Step 3.Turn key to “RUN” position. Check for voltage at orange lead on blackout toggleswitch 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)2-72
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