Kohler K9J Service Manual page 82

TROUBLE ANALYSIS - 10 AMP ALTERNATOR SYSTEM
TEST WITH ENGINE RUNNING AT 3600 RPM - NO LOAD
CONDITION: No Charge To Battery
TEST A -- Disconnect B+ cable to positive terminal of
battery. Connect DC Voltmeter between B+
cable and ground. Check DC voltage:
A-1 -- If above 14 volts.
A-2 -- If less than 14 volts (but above 0 volts).
Possible Fault/Remedy
A-1 --Alternator system OK--ammeter may be giving false
reading. Repair or replace ammeter.
A-2 -- Check for defective rectifier-regulator
(TEST C).
A-3 -- If 0 volts. A-3 -- Check for defective stator or rectifier - regulator
(Test C).
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TEST B --With B+ cable reconnected, check B+ (at
terminal on rectifier-regulator) to ground
with DC Voltmeter. If 13.8 volts or higher,
place minimum load of 5 amps • on battery
to reduce voltage.
B-1 -- If charge rate Increases. B-1 -- Indicates alternator system OK, battery was
fully charged.
B-2 -- If charge rate does not Increase. B-2 -- Check for defective stator or rectifier - regulator
(TEST C).
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TEST C -- Unplug leads at rectifier-regulator, connect
VOM (multimeter) across AC leads, check
AC voltage:
C-1 -- If less than 20 volts.
C-2 -- If more than 20 volts.
CONDITION: Battery Continuously
Charges At High Rate
TEST D -- Check B+ to ground with DC Voltmeter:
D-1 --If over 14.7 volts.
D-2 -- If under 14. 7 volts.
C-1 -- Defective stator, replace with new assembly.
C-2 -- Defective rectifier-regulator, replace with new unit.
Possible Fault/Remedy
D-1 -- Rectifier - regulator not functioning properly. Replace
with new unit.
D-2 -- Alternator system OK. Battery unable to hold charge.
Check specific gravity of battery. Replace If neces-
sary.
*Turn lights on If 60 watts or
more
or
simulate load by placing
a
2.5 ohm 100 watt resistor
across
battery terminals.
8.12