TM 5-3740-218-13&PTable 5-1. Direct Support TroubleshootingMalfunctionTest or InspectionCorrective ActionENGINE AND PUMP ASSEMBLY1. ENGINE FAILS TO START.WARNINGFailure to disconnect battery can result in personal injury or damage to equipment.Step 1. Check for defective key switchbox.•Disconnect battery.•Set engine switch to OFF position.•Inspect for loose, broken, or missing wires or blown fuseinside key switchbox. Tighten, repair, or replace wires orblown fuse (para 5-5).•Check continuity of oil level switch:With multimeter set to ohms scale, measure resistancebetween black and yellow leads, black lead to ground, andyellow lead to ground. Readings should not exceed 0.1 ohm. Ifreadings exceed 0.1 ohm, replace key switchbox (para 5-5).•Check continuity of key switch:With multimeter set to ohms scale, measure resistancebetween black and green leads, yellow and green leads, andyellow lead to ground. Readings should not exceed4 K ohms. If readings exceed 4 K ohms, replace keyswitchbox (para 5-5).•Set engine switch to ON position.•Check continuity of oil level switch:With multimeter set to ohms scale, measure resistancebetween black and yellow leads. If reading exceeds 0.1 ohm,replace key switchbox (para 5-5).With multimeter set to ohms scale, measure resistancebetween black lead and ground, and yellow lead and ground.If readings are not 1 M ohm minimum, replace key switchbox(para 5-5).•Check continuity of key switch:With multimeter set to ohms scale, measure resistancebetween green lead and ground. If reading exceeds4 K ohms, replace key switchbox (para 5-5).5-3
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