47).
Disconnect the opposite lead 66 from the starter relay.
Now place the multimeter red lead probe in relay 66 receptacle
and ground the black probe. Hold the PREHEAT and START switches
ON and set the MASTER switch to the ON position. If no voltage
is indicated during this test, replace the starter relay as
outlined in TM 9-2350-267-20.
If voltage is indicated during
this test, proceed to Test 15.
Figure 47.
APU Lead 66, Wiring Harness 12329640.
o
Test 15. This test determines if voltage is flowing through lead
66 from the outlet side of the starter relay to terminal B of the
APU generator.
Set the MASTER switch to the OFF position and
reconnect lead 66 to the starter relay (Figure 48).
Place the
red multimeter probe on terminal B of the APU generator and
ground the black probe.
Now set the MASTER switch to the ON
position and hold the PREHEAT and START switches ON.
If no
voltage is indicated, repair or replace lead 66 between the APU
starter relay and generator terminal B as outlined in TM 9-2350-
267-20. If voltage is indicated, proceed to Test 16.
o
Test 16.
This test determines if voltage is present at lead S
terminal at the preheat solenoid mounted diode. Set the MASTER
switch to the OFF position. Now place the red multimeter probe
on lead S terminal at the preheat solenoid mounted diode and the
black probe to a good ground.
Hold the PREHEAT and START
switches ON (Figure 49). If no voltage is indicated, replace the
diode as outlined in TM 9-2350-267-20. If voltage is indicated,
proceed to Test 17.
42
OD1702
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