AUXILIARY POWER UNIT FAILS TO CRANK - TM-9-2350-292-20-1

AUXILIARY POWER UNIT FAILS TO CRANK - TM-9-2350-292-20-1_129

AUXILIARY POWER UNIT FAILS TO CRANK - TM-9-2350-292-20-1_131

TM-9-2350-292-20-1 Carrier Ammunition Tracked M992A1(NSN 2360-01-362-3021) EIC:AE6 Manual
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TM 9--2350--292--20--1 0018 00--4 AUXILIARY POWER UNIT FAILS TO CRANK -- CONTINUED 0018 00 no yes CONTINUED FROM STEP F G Is continuity present? H no yes CONTINUED ON NEXT PAGE Replace preheat relay (WP 0664 00). Verify fault is corrected. Repair (WP 0290 00) or replace (WP 0649 00) harness 3W711. Verify fault is corrected. 1. Reconnect lead P to preheater relay. 2. Disconnect lead 487 at preheater relay. 3. Place multimeter red lead to preheater relay terminal and black lead to ground. 4. Turn MASTER switch ON (TM 9--2350--292--10). 5. Turn PREHEAT switch to MOM ON (TM 9--2350--292--10). Check for voltage. 6. Turn MASTER switch OFF. Is 24 V dc present? 1. Disconnect harness 3W702 J1 from harness 3W711 P1. 2. Place multimeter red lead to lead 487 and black lead to pin D of harness 3W711 P1. 3. Check for continuity. no yes I Replace diode (WP 0639 00). Verify fault is corrected. Is 24 V dc present? 1. Reconnect harness 3W711 P1 to harness 3W702 J1. 2. Reconnect lead 487 to preheater relay. 3. Disconnect harness 3W711 lead S from diode terminal. 4. Place multimeter red lead to diode terminal and black lead to ground. 5. Turn MASTER switch ON (TM 9--2350--292--10). 6. Turn PREHEAT switch to MOM ON (TM 9--2350--292--10). Check for voltage. 7. Turn MASTER switch OFF.

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