TM 9--2350--292--20--10018 00--10AUXILIARY POWER UNIT FAILS TO CRANK -- CONTINUED0018 00CONTINUED FROM STEP VWnoyesnoyesXIs continuity present?YnoyesCONTINUED ON NEXT PAGEIs continuity present?Replace generatorswitch S4 (WP 0247 00).Verify fault is corrected.Repair (WP 0290 00) or replace(WP 0658 00) lead 3W732 wire R.Verify fault is corrected.1. Reconnect ground wire to PREHEAT switchS2 connector.2. Disconnect ground wire from APU GEN switchS4 terminal 5.3. Place multimeter leads across APU GENswitch S4 terminals 5 and 6.4. Check for continuity.1. Reconnect ground wire to APU GEN switchS4 terminals 6.2. Place multimeter red lead onto 4W725 pin Cand black lead on to ground wire.3. Check for continuity.4. Reconnect ground wire to APU GEN switchS4 terminal 5.Is continuity present?Repair (WP 0290 00) or replace(WP 0247 00) harness 4W725.Verify fault is corrected.1. Disconnect lead 3W732 wire R from the preheatsolenoid and from glow plug connector.2. Place multimeter red leads across harness3W732 connectors.3. Check for continuity.4. Reconnect harness 3W732 wire R to thepreheat solenoid connector.
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