TM 9-4120-402-14
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(a) Using a multimeter set to test diodes, connect black lead to band end of diode and red lead to opposite
end. The multimeter should indicate between 0.5 and 1.75 volt drop.
(b) Reverse the leads from step (a) above and check. The multimeter should give no indication.
(3) Surge arrestor (10).
Check continuity across leads. The multimeter should indicate an open circuit.
d. Replace.
(1) Replace relay (5) if defective.
(2) Replace diode (9) if defective.
(a) Cut insulation sleeving (11) to 3/4 inch (1.9 cm) long.
(b) Slip insulation sleeving (11) over leads.
(c) Crimp lug terminals (12) onto lead ends.
(3) Replace surge arrestor (10) if defective.
(a) Cut insulation sleeving (13) and insulation tubing (14) to approximately 1 inch (2.5 cm) long each.
(b) Slip insulation sleeving (13) over arrestor (10) body and insulation tubing (14) over leads. Heat to
shrink insulation sleeving (13) in place.
(c) Crimp lug terminals (15) onto lead ends.
e. Install.
(1) Mount relay (5) to bracket (4) using four sets of screws (6), lock washers (7), and flat washers (8).
(2) Using wiring diagram figure 4-10 and tags, connect leads, diode assembly, and surge arrestor assembly to
relay (5). Band end of diode connects to terminal X1. Remove tags.
(3) Carefully position relay bracket (4) and relays (5) in control assembly and secure with three sets of screws
(1), lock washers (2), and flat washers (3).
(4) Using wiring diagram figure 4-10 and tags, connect wire leads to ground E3. Remove tags.
NOTE
FOLLOW-ON MAINTENANCE:
Connect power at power source.
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