TM 5-6115-627-14&P
(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 connectors each have eight pins.
(1)
(2)
(3)
(4)
(5)
(6)
(7)
WARNING
To avoid risk of injury or death by electrocution, do not remove switch box access 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 G1 through G4.
Remove 24 screws, 24 Iockwashers, and 24 flat washers securing access 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 A1 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, C, and N. Multimeter must indicate continuity only between these
pins and switch terminals B1, C1, and TB1 L0 terminal, respectively.
Touch one multimeter test probe to ground stud E1 on connector side of switch box. Touch remaining
probe to pins G1, G2, G3, and G4, in turn. Multimeter must indicate continuity on each pin.
If continuity test detects any opens or shorts, connector cable assembly is defective.
c.
Wiring Test. (Refer to wiring diagram, figure 4-14.) The internal switch box wiring is tested by performing a
continuity check(s) on suspect wires or connections.
WARNING
To avoid risk of injury or death by electrocution, do not remove switch box access cover
while either power unit is still connected to switch box.
4-29
