Kohler COMMAND PRO CS10, Service Manual

Page: 69 / 154

8.15
Section 8
Electrical System and Components
8
Troubleshooting Guide
Battery Charging System
NOTE: Zero ohmmeters on each scale to ensure accurate readings. Voltage tests should be made with engine
running at 3600 RPM - no load. Battery must be fully charged. Check the specific gravity of battery. If low,
recharge or replace battery as necessary.
Problem Test Conclusion
1. Refer to Figure 8-19. Separate the bullet
connector in the red lead from the rectifier-
regulator. Connect an ammeter from the
female terminal to the positive (+) terminal of
the battery. Connect a DC voltmeter from the
female terminal to the negative (-) terminal of
the battery. Leave the other rectifier-regulator
leads connected in the normal manner. Run
the engine at 3600 RPM and read the voltage
on the voltmeter.
If voltage is 14.0 volts or more, place a
minimum load of 5 amps* on battery to
reduce voltage. Observe ammeter.
*NOTE: Turn on lights (if 60 watts or more)
or place a 2.5 ohm, 100 watt
resistor across battery terminals.
1. If voltage is 14.0-15.0 volts and charge rate
increases when load is applied, the charging
system is OK and the battery was fully
charged.
If voltage is less than 14.0 volts or charge
rate does not increase when load is applied,
test stator (Tests 2 and 3).
2. Separate the bullet connectors in the AC
(white) leads. Connect an AC voltmeter
across the stator leads (female terminals).
With engine running at 3600 RPM, measure
the AC output from the stator.
2. If voltage is 20.0 volts or more, stator is OK.
Rectifier-regulator is faulty. Replace the
rectifier-regulator.
If voltage is less than 20.0 volts, stator is
probably faulty and should be replaced. Test
stator further using an ohmmeter (Test 3).
3a. With engine stopped, measure the resistance
across stator leads using an ohmmeter.
3a. If resistance is 0.08/0.26 ohms, the stator is
OK.
If the resistance is 0 ohms, the stator is
shorted. Replace stator.
If the resistance is infinity ohms, stator is
open. Replace stator.
No
Charge
to
Battery
3b. With the engine stopped, measure the
resistance from each stator lead to ground
using an ohmmeter.
3b. If the resistance is infinity ohms (no
continuity), the stator is OK (not shorted to
ground).
If resistance (or continuity) is measured, the
stator leads are shorted to ground. Replace
stator.
1. If the voltage is 15.0 volts or less the charging
system is OK. The battery is unable to hold a
charge. Service or replace battery as
necessary.
If voltage is more than 15.0 volts, the
rectifier-regulator is faulty. Replace the
rectifier-regulator.
1. Perform same test as step 1 above.
Battery
Continuously
Charges at
High Rate