Kohler Command PRO CS Service Manual page 76

Section 8
Electrical System and Components
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
1. Refer to Figure 8-26. 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)
2. Separate the bullet connectors in the AC
(white) leads. Connect an AC voltmeter across
No
the stator leads (female terminals). With
Charge
engine running at 3600 RPM, measure the AC
to
output from the stator.
Battery
3a. With engine stopped, measure the resistance
across stator/charging leads using an
ohmmeter. Compare the meter reading
obtained against the specified range, based on
the charging system involved.
3b. With the engine stopped, measure the
resistance from each stator lead to ground
using an ohmmeter.
1. Perform same test as step 1 above.
Battery
Continuously
Charges at
High Rate
8.20
Test
or place a 2.5 ohm, 100 watt resistor
across battery terminals.
Conclusion
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. 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. If resistance value obtained is within the range
specified the stator is OK.
C h a g r n i g S s y e t m N r o
1 2 . a n d 1 6 . a m p
. 0 5 8 a n d 3 0 . a m p
, 7 1 , 0 a n d 8 1 a m p
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.
m l a R s e s i a t n e c o ( h m ) s
. 0 0 9 - 1 6 . o h m s
. 0 8 2 - . 0 0 5 o h m s
. 0 0 1 - . 0 0 3 o h m s