TM 10-4320-315-24Table 2-2. Troubleshooting ProceduresMALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION1.ENGINE DOES NOT CRANK.NOTERefer to electrical schematics of control panel and engine wiring harness when making voltageand resistance checks.Step 1.While attempting to crank engine observe voltmeter on control panel.If no voltage is indicated, check for open in wiring and main power and start/run switches usingmultimeter. Replace/repair wiring harness or replace defective switch as required (para. 2-23 and 2-24).If voltage is greater than 0 but less than 18 VDC, charge or replace battery (para. 2-16).Step 2.If battery was charged/replaced in step 1 and engine is now running, recheck voltage.If voltage of 24 VDC or above is indicated, continue with mission.If voltage reading of less than 24 VDC is indicated, original fault may have been caused by faultyalternator, replace alternator (para. 2-52).Step 3.Check for loose wire/cable connections on batteries, starter and starter relay, and check all groundconnections.As required tighten cable/wire connections. If engine still does not crank, replace starter and notifydirect support maintenance.Step 4.Hold start switch to start position and check for 24 VDC at starter power input terminal.If 24 VDC is not measured, check batteries.If 24 VDC is measured, check starter circuitry between:a.Starter solenoid and 24 VDC slave receptacle.b.Slave receptacle and batteries.c.Pin N24 and starter solenoid.If engine still does not start, notify direct support maintenance.2.ENGINE CRANKS, BUT DOES NOT START OR IS HARD TO START.Step 1.Using multimeter, check voltage across battery terminals.If reading is less than 24 volts, service or replace batteries (para. 2-16).2-16
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