Chapter 9 - Electrical
301
1. First check the raw A.C. Voltage out-put from the
stator. It will be necessary to compare it to the
engine manufacturer’s specified out-put. This
varies from model to model. See Figure 9.56.
NOTE: On Caterpillar 45 amp alternators used
in the Cub Cadet 4X4, it is not possible to isolate
the raw voltage out-put.
NOTE: On the Kohler 15 amp system used in
the Cub Cadet 4X4 utility vehicle, peak voltage
at 3,600 RPM should be above 28 volts.
1a. With a DVOM set to read A.C. Voltage,
connect the probes between ground and
one of the white wires from the stator.
1b. Leave the regulator-rectifier connected to
the harness.
1c. Start the engine and run it at 3,600 RPM.
1d. Read the voltage on the meter.
1e. If the voltage is substantially low, try the
other white wire.
Figure 9.56
Regulator / rectifier
+ probe to
white wire
Raw stator out-put
@3,600 RPM
2. If raw out-put of the running Kohler alternator is
less than 28 volts, check the stator.
2a. With the engine stopped, unplug the stator
lead from the voltage regulator / rectifier.
2b. Check the stator for resistance across the
leads. It should be in the range of 0.1 -
0.2Ω. See Figure 9.57.
2c. With the engine stopped and the stator
lead unplugged from the voltage regulator
/ rectifier, check the resistance from each
purple stator lead to ground (engine
block).
2d. The meter should indicate 1.0 Ω or O.L.,
indicating no continuity.
See Figure 9.58.
Figure 9.57
Probes to white wires show
normal resistance through
stator windings: GOOD
White wires: stator
Figure 9.58
No continuity between
stator and ground:
GOOD
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