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).CONTINUED FROM DD. 3. Disconnect harness 12329640 from APUcompartment wall.4. Using multimeter check continuity betweenlead 66 and pin A of harness connector12329640.Is continuity indicated?Repair lead 66 or replace harness12329640 (para 18-21). Verifyproblem is solved.E. 1. Disconnect lead 66 from connector 10.2. Using multimeter check continuity fromsocket A and pin on wire 66.Is continuity indicated?F. 1. Connect lead 66 to connector 10.2. Connect lead 66 to input of APU starterrelay.3. Connect harness 12329640 to APU com-partment wall connector.4. Disconnect lead 6512329640 from inputside of APU starter relay.5. Place red probe of multimeter in socket oflead 65 and ground black probe.Continued on next page2-305Repair lead 66 or replace harness12330248 (para 7-71). Verify problemis solved.
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