TM 9-2350-287-20-12-19. TROUBLESHOOTING CHART (continued).u. AUXILIARY POWER UNIT (continued).(2) ENGINE FAILS TO CRANK. All other electricalsystems operate (continued).F.6. With the aid of an assistant turn MASTERswitch ON and hold APU PREHEAT ANDSTART switch (refer to TM 9-2350-287-10).7. Check for 24 ± 3 vdc.8. Release APU PREHEAT AND STARTswitch and turn MASTER switch OFF (refer toTM 9-2350-287-10).Replace starter relay (para 18-18).Verify problem is solved.G. 1. Disconnect harness 12329640 from APUcompartment wall connector.2. Place multimeter red probe in lead 65 andblack probe on pin E of harness 12329640connector.3. Check for continuity.Repair wire 65 or replace harness 12329640(para 18-21). Verify problem is solved.H.1. Connect lead 65 to onput side of APUstarter relay.2. Disconnect harness 12330248 from APUcontrol box.3. Place multimeter red probe in socket E ofharness 12330248 APU wall mount connec-tor and black probe in socket D of harness12330248 APU control box connector.4. Check for continuity.Continued on next page2-306
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