TM 9-2350-256-20-1
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CORRECTIVE ACTION Continued
11. Place a jumper wire from wire 27 to terminal of LOW OIL PRESS 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 420A of APU control box wiring harness (see WP 0438 00). If voltage is
not present, replace lamp socket (see WP 0438 00).
12. Install APU control box (9), four screws (8), four lockwashers (7), and four nuts (6) to mounting
bracket. Reconnect APU control box to foot dimmer switch and bulkhead wiring harness to APU
control box. Disconnect bulkhead to APU, master relay, and rigger's lights wiring harness from
bulkhead disconnect. Place red lead of multimeter on pin C of wire 420A 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 13. If voltage is not present,
repair/replace wire 420A of APU control box to foot dimmer switch and bulkhead wiring harness (see
WP 0228 00 for dual voltage; 0229 00 for single voltage).
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