TM 9-2350-256-20-1
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CORRECTIVE ACTION Continued
10. Reconnect wire 421 to APU FUEL SHUTOFF switch. Disconnect connector from HIGH AIR TEMP
lamp. Place red lead of multimeter on wire 27 and black lead to ground. Turn MASTER and APU
FUEL SHUTOFF switches ON and check for voltage. Turn MASTER and APU FUEL SHUTOFF
switches OFF. If voltage is present, go to step 11. If voltage is not present, repair/replace wire 421/27
of APU control box wiring harness (see WP 0438 00).
11. Place a jumper wire from wire 27 to terminal of HIGH AIR TEMP lamp. Place red lead of multimeter
on terminal of lamp and black lead to ground. Turn MASTER and APU FUEL SHUTOFF switches
ON and check for voltage. Turn MASTER and APU FUEL SHUTOFF switches OFF. If voltage is
present, repair/replace wire 493 of APU control box wiring harness (see WP 0438 00). If voltage is not
present, replace HIGH AIR TEMP lamp (see WP 0438 00).
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