TM 5-3895-370-14&PTable 4-4. Unit Troubleshooting Procedures - CONT.MalfunctionTest or inspectionCorrective actionELECTRICAL SYSTEM20. MARKERLIGHT DOES NOT OPERATE.NOTEThis fault can apply to any single light that does not operate.Step 1. Check continuity across lamp.If there is no continuity, replace lamp (para 4-77).If there is continuity, go to step 2.Step 2. Check for voltage at lamp socket.If 12 +3 vdc is not measured, go to step 4.If 12 +3 vdc is measured, go to step 3.Step 3. Check continuity of socket ground.If there is no continuity, repair or replace markerlight (para 4-77).If there is continuity, go to step 4.Step 4. Disconnect wire from markerlight and check for voltage from chassis wire harness (black wire).If 12 +3 vdc is not measured, repair or replace chassis wire harness (para 4-88).If 12 ±3 vdc is measured, replace markerlight socket assembly (para 4-77).21. TURN SIGNAL LIGHT DOES NOT OPERATE.Step 1. Check continuity across lamp.If there is no continuity, replace lamp (para 4-79).If there is continuity, go to step 2.Step 2. Check for voltage at lamp socket.If 12 +3 vdc is not measured, go to step 4 (12-volt system) or step 6 (24-volt system).If 12 ±3 vdc is measured, go to step 3.4-26
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