TM 10-4520-259-13&P
5-14.
CONTROL BOX ASSEMBLY (CONT)
d.
Set power switch (8) to on. With multimeter on low ohms scale, repeat measurements in paragraph c.
The meter should indicate continuity for points connected by same color wire.
e.
Replace power switch (8) as described in removal d. through f., and installation 1. and m., if defective.
f.
With multimeter on high ohms scale, measure from the three input terminals to the three corresponding
output terminals of motor contactor (2). Meter should indicate an open circuit.
g.
With multimeter on low ohms scale, push in motor contactor solenoid, and repeat measurements in f.
Meter should indicate continuity.
h.
Replace defective motor contactor (2) as described in removal h. and i.; and installation h. and i.
i.
Tag and disconnect wires from terminals 1 and 2 of low water relay (3).
j.
With multimeter on high ohms scale measure between terminals 1 and 2. Meter should indicate an
open circuit.
5-40
