TM 10-4930-236-13&P
NOTE
Failure of motor thermostatic switch can prevent relay operation.
(4)
The “X” circuit of the relay is grounded through the thermostatic switch in the motor. To check
continuity, put probe on "X2” terminal of relay, and the other probe on negative (-) of the J2 connector.
CAUTION
The following tests require the power cable be connected as in
normal pumping procedure. Exercise care in use of multimeter
test probes.
(5)
Connect power cable to J2 and to vehicle NATO slave connector.
(6)
Hold negative (-) probe of multimeter on inner threaded portion of junction box for ground.
(7)
Touching positive (+) probe of multimeter to “A1” terminal of relay should give 24 + 2 volt
reading.
(8)
All other terminals should have zero readings.
(9)
Place ON-OFF switch in ON position.
(10)
Ground negative (-) probe of multimeter as above.
(11)
Touching positive (+) probe of multimeter to "X1" terminal of relay should give 24 + 2 volt
reading.
(12)
Touching positive (+) probe of multimeter to "A1" terminal of relay should give 24 + 2 volt
reading.
(13)
Touching positive (+) probe of multimeter to “A2” terminal should give 24 + 2 volt reading.
(14)
Switch ON-OFF switch to the OFF position.
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