TM 9-2350-256-20-1
0063 00
CORRECTIVE ACTION Continued
10. Reconnect wire 420B to ENGINE OIL PRESSURE gage. Disconnect wire 420 from ENGINE OIL
PRESSURE gage. Place red lead of multimeter on terminal of gage 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 420 of APU control box
wiring harness (see WP 0438 00). If voltage is not present, replace ENGINE OIL PRESSURE gage
(see WP 0438 00).
11. Install APU control box (9), four screws (8), four lockwashers (7), and four nuts (6) to mounting
bracket. Open air inlet doors (TM 9-2350-256-10). 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 E 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 12. If voltage
is not present, repair/replace wire 420 of APU control box to foot dimmer switch and bulkhead wiring
harness (see WP 0228 00 for dual voltage; 0229 00 for single voltage).
0063 00-8
