Kohler Comand Pro CH1000, Service Manual, Page: 69 / 142

7.17
Section 7
Electrical System and Components
7
Troubleshooting Guide
15/20/25 Amp Battery Charging Systems
When problems occur in keeping the ba tt ery charged or the ba tt ery charges at too high a rate, the problem can
usually be found somewhere in the charging system or with the ba tt ery.
NOTE: Always zero ohmmeter on each scale before testing to ensure accurate readings. Voltage tests should
be made with the engine running at 3600 RPM - no load. The ba tt ery must be good and fully charged.
Problem Test Conclusion
No Charge
to Battery
1. Trace B+ lead from recti fi er-regulator to
key switch, or other accessible connection.
Disconnect it from switch or connection.
Connect an ammeter from loose end of B+
lead to positive terminal of ba
tt ery. Connect
DC voltmeter from loose end of B+ lead to
negative terminal of ba
tt ery. With engine
running at 3600 RPM, read voltage on
voltmeter.
If voltage is 13.8 volts or more, place a
minimum load of 5 amps* on ba tt ery to
reduce voltage. Observe ammeter.
*NOTE: Turn on lights, if 60 wa tt s or more.
Or place a 2.5 ohm, 100 wa tt resistor
across ba tt ery terminals.
1. If voltage is 13.8-14.7 and charge rate
increases when load is applied, the charging
system is OK and ba
tt ery was fully charged.
If voltage is less than 13.8 or charge rate does
not increase when load is applied, test stator
(Tests 2 and 3).
2. Remove connector from recti fi er-regulator.
With engine running at 3600 RPM, measure
AC voltage across stator leads using an AC
voltmeter.
2. If voltage is 28 volts or more, stator is OK.
Recti fi er-regulator is faulty. Replace the
recti fi er-regulator.
If voltage is less than 28 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 0.064/0.2 ohms, the stator is
OK.
If the resistance is in fi nity ohms, stator is
open. Replace stator.
3b. With the engine stopped, measure the
resistance from each stator lead to ground
using an ohmmeter.
3b. If the resistance is in fi nity 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.
Battery
Continuously
Charges at
High Rate
1. Perform same test as Step 1 above. 1. If the voltage is 14.7 volts or less the charging
system is OK. The ba tt ery is unable to
hold a charge. Service ba tt ery or replace as
necessary.
If voltage is more than 14.7 volts, the
recti fi er-regulator is faulty. Replace recti fi er-
regulator.