TM 5-6115-628-14&P
WARNING
To avoid risk of injury or death by electrocution, do not remove switch box rear
cover while either power unit is still connected to switch box.
(1) Remove 18 screws, 18 Iockwashers, and 18 flat washers securing rear cover to switch
box and remove cover.
(2) Set multimeter controls to prepare unit for continuity testing.
(3) Set switch being tested to ON position.
NOTE
Observe that the switch terminals are arranged in two rows of three terminals each. Each terminal is
paired with the one directly above or below it. There is one pair of terminals for each pole of the
switch.
(4) Select any pair of terminals associated with same pole of switch. Touch one multimeter test
probe to each terminal. Multimeter must indicate continuity.
(5) Repeat step (4) on both remaining poles of switch.
(6) If multimeter does not indicate continuity across all three poles of switch, switch is
defective. Refer switch to higher level of maintenance.
b. Connector Testing. The switch box has four male cable connectors. The larger connectors, J1
and J2, are the power input connectors. Together with their associated wiring, they comprise the
switch box cable assemblies. This procedure tests the entire cable assembly. The procedure is as
follows:
(1)
(2)
(3)
(4)
(5)
4-28
WARNING
To avoid risk of injury or death by electrocution, do not remove switch box rear
cover while either power unit is still connected to switch box.
NOTE
Observe that pins on power input connectors are labeled A, B, C, N, and G.
Remove 18 screws, 18 Iockwashers, and 18 flat washers securing rear cover to switch
box and remove cover.
Set multimeter controls to prepare unit for continuity testing.
Touch one multimeter test probe to pin A in connector being tested and touch remaining
probe to terminal C on associated switch. Multimeter must indicate continuity. If it does
not, there is an open in connector or associated wire.
With first probe still in contact with pin A, touch remaining probe to all other pins in
connector. Multimeter must not indicate continuity. If it does, connector is shorted.
Repeat steps (3) and (4) for pins B and C. Multimeter must indicate continuity only
between these pins and switch terminals B and A, respectively.
