Engine Service Manual

37
Electrical System
14 690 10 Rev. -- KohlerEngines.com
1 Amp Battery Charging System
NOTE: Zero ohmmeters on each scale to ensure accurate readings. Voltage tests should be made with engine
running at high speed - no load. Battery must be fully charged. If low, recharge or replace battery as
necessary.
To test charging system for no charge to battery:
1. Connect DC voltmeter red positive (+) lead to
positive (+) terminal of battery. Connect voltmeter
black negative (-) lead to negative (-) terminal of
battery. Observe battery voltage. Run engine at high
speed and read voltage on voltmeter.
If running battery voltage is higher than non running
observed voltage, charging system is functioning.
Condition Conclusion
Battery voltage increases
when engine is running.
Charging system is OK.
Battery voltage does not
increase when engine is
running.
Test diode and stator
(steps 2, 3, and 4).
2. Disconnect diode (rectifi er) from harness. Perform
continuity test from male bullet connector to female
connector; record results. Switch test leads to
opposite connectors and repeat continuity test.
Condition Conclusion
Continuity is measured in
one direction only.
Diode is OK. Test stator
(steps 3 and 4).
If open in both tests or
closed in both tests.
Replace diode.
3. Connect an AC voltmeter to stator lead connect
other lead to crankcase ground. With engine running
at high speed, measure AC output from stator.
Condition Conclusion
Voltage is measured. Stator is OK.
Voltage is not measured. Stator is probably faulty
and should be replaced.
Test stator further using
an ohmmeter (step 4).
4. With engine stopped, measure resistance from
stator lead to ground using an ohmmeter.
Condition Conclusion
Resistance is infi nity
ohms (no continuity).
Stator is OK (not shorted
to ground).
Resistance (or continuity)
is measured.
Stator lead is shorted to
ground; replace stator.