Kohler EKOZD Series Service page 197

Disabling the generator set.
cause severe injury or death.
generator set or equipment connected to the set, disable the
generator set as follows: (1) Press the generator set off/reset
button to shut down the generator set. (2) Disconnect the
power to the battery charger, if equipped. (3) Remove the
battery cables, negative (- ) lead first. Reconnect the negative
(- ) lead last when reconnecting the battery. Follow these
precautions to prevent the starting of the generator set by the
remote start/stop switch.
1. Disconnect the battery (negative lead first).
2. Disconnect leads AC1, AC2, and AC3 from the
FRX activator board or remove the activator board
from the spacer.
3. Visually check the exciter armature for shorted or
open winding(s)
4. With an ohmmeter, check for continuity across the
AC1/AC2, AC2/AC3, and AC1/AC3. Check for
continuity across AC1/core (ground), AC2/core
(ground), and AC3/core
Figure 11-9. See Section 1.8, Specifications,
Electrical Values for exciter armature resistance
values.
AC2
AC1
Make ohmmeter connections across:
1. AC1 and AC2 leads
2. AC2 and AC3 leads
3. AC1 and AC3 leads
4. AC1 lead and core (ground)
5. AC2 lead and core (ground)
6. AC3 lead and core (ground)
Figure 11-9 Exciter Armature Continuity Check
TP-6953 7/19
Accidental starting can
Before working on the
(ground).
AC3
Core
(Ground)

GC70064-E/
TP-6783-3
Out of
non-functional
replacement. Low resistance readings indicate a
shorted winding. High resistance readings indicate
an open winding.
between any lead and ground.
5. Repair the leads if damaged or open. Solder and
insulate the splices. Use new sleeving as needed
when tying leads to the core.
6. Using a megohmmeter, apply 500 volts DC to the
exciter armature core and each lead.
Figure 11-10. Place the exciter armature on a
non-conductive surface when performing the test.
Follow the instructions of the megohmmeter
manufacturer when performing this test.
A reading
(1/2 megohm) and higher indicates the winding is
good.
A reading of less than 500 kOhms (approximately)
See
indicates deterioration of winding insulation and
possible current flow to ground.
7. Repair or replace exciter armature if the test shows
a winding is shorted to ground. Repair the leads if
damaged or open. Solder and insulate the splices.
Use new sleeving as needed when tying leads to
the core.
AC2
AC1
Make megohmmeter connections across:
1. AC1 lead and core (ground)
2. AC2 lead and core (ground)
3. AC3 lead and core (ground)
Figure 11-10 Exciter Armature High Voltage Test
Section 11 Alternator Component Testing and Adjustment
specification readings
exciter armature
No continuity should exist
of approximately
M
indicate a
requiring
See
500 kOhms
AC3
Core
(Ground)
GC70064-E/
TP-6783-3
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