APU Terminals N and P.
APU Terminal P.
Do a voltage test on terminal 487 by placing the
multimeter red probe on terminal 487 and placing the black probe
on a good ground (Figure 40).
If no voltage is indicated, the
preheat solenoid is defective and Support Maintenance must be
notified. If voltage was indicated during this test, then Test 5
must be accomplished.
With the MASTER switch in the OFF position, locate
terminal D, lead 487, in the APU harness plug.