Replace a defective output selector
(1) Install top and bottom mounting brackets to
output selector switch.
(2) Position output selector switch in control box
(3) Reconnect all leads on output selector switch.
Secure switch to control box assembly.
Install access cover on control box assembly.
Install control box assembly on generator
Install ground straps.
Connect cannon plugs.
Install power cable.
Test generator set operation.
7-4 Relay Panel and Field Flash Switch
Removal. Refer to Figure 71 and the following
instructions to remove the relay panel and field flash switch.
(1) Tag and disconnect leads from the relay panel
and the field flash switch.
(2) Remove the nuts, washers, and screws that
secure the relay panel to the control box.
(3) Remove the relay panel.
(4) Remove the locking nut that secures the field
flash switch to the relay panel.
(5) Remove the field flash switch.
Cleaning and Inspection.
(1) Clean the field flash switch and relay panel
using a clean lint free cloth to remove any accumulated
(2) Inspect switch contact for corroded or burned
(3) Inspect terminal board for cracks, breaks,
corroded terminals, or other apparent damage.
(4) Inspect relays and resistors for signs of
overheating or other damage.
(1) Refer to figure FO-2 for resistor rating. Use a
multimeter and test on the appropriate resistance (ohm)
(2) Test the field flash switch for continuity while
Repair. Replace a damaged or defective field
flash switch or relay panel.
(1) Position the field flash switch in place on the
relay panel and secure with locking nut.
(2) Position the relay panel in place in the con-
trol box and secure with screws, washers, and nuts.
(3) Reconnect leads.
7-5. Current Transformer (CT) and Resistors
(1) Disconnect the current transformer leads and
remove the three resistors.
Never disconnect the leads of a current
transformer, either at the transformer or at a
meter connected to the transformer, when the
equipment is energized. The three resistors
used with this equipment are connected across
the secondary windings of the current
transformer and they ordinarily prevent an open
circuit condition. But, if a resistor were to fail
and then the secondary were to be
open-circuited by disconnecting its load (the
meter), extremely high voltages would be
induced in the windings. Serious damage to the
equipment and possibly the death of personnel
the switch is held in the closed (ON) position. -