TM9-4120-370-14
TO35E9-229-1
Remove junction box. (See para 4-45.)
Preliminary procedure:
a.
Removal
(1)
Using a screwdriver, remove ten screws and lock washers from junction box cover.
Remove cover.
(2)
Tag and disconnect wire leads.
(3)
(4)
Using screwdriver. remove four screws from relay.
Remove U type spring nuts from relay.
(5)
Remove relay.
(6)
b. Inspection
(1) Check for loose, corroded, missing, or broken terminal connections.
(2) Check relay for cracks, evidence of overheating, and other visible damage. Replace if damaged.
Test
c.
(1)
Use a continuity tester or a Multimeter set on the lowest OHMS scale to check continuity between terminals
A1 and A2, B1 and B2, and C1 and C2. All three contacts should be open. If there is continuity, replace
the relay.
Check continuity between coil terminals X1 and X2. If there is no continuity, the coil is open. Replace the
(2)
(3)
Apply external 24 volts dc power source across terminals X1 and X2 and repeat continuity checks between
terminals A1 and A2, B1 and B2, and C1 and C2. All three contacts should be closed. If there is no continu-
ity, replace the relay.
