Kohler K91 Service Manual page 82

TROUBLE ANALYSIS
CONDITION: No Charge To Battery
TEST A -- Disconnect B+ cable to positive terminal of
batte ry . Connect DC Voltmeter between B+
cable and ground . Check DC voltage :
A-1 - - I f above 1 4 volts .
A-2 - - I f less than 1 4 volts (but above 0 volts ) .
A-3 -- If 0 volts .
TEST B -- With B+ cable reconnected , check B+ ( at
terminal on rectifier-regulator) to ground
with DC Voltmeter. If 1 3 . 8 volts or higher,
place minimum load of 5 amp s · on battery
to reduce voltag e .
B - 1 -- If charge rate Increase s .
B-2 -- If charge rate does not Increase .
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TEST C -- Unplug leads at rectifier-regulator , connect
VOM (multimeter) across AC lead s , check
AC voltag e :
C - 1 - - If less than 20 volt s .
C-2 -- If more than 20 volt s .
CONDITION : Battery Continuously
Charges At High Rate
TEST D -- Check B+ to ground with DC Voltmeter:
D-1 -- If over 1 4 . 7 volt s .
D - 2 - - If under 1 4 . 7 volts .
Turn lights on If 60 watts or more or simulate load by placing a 2 . 5 ohm 1 00 watt resistor across battery terminals .
•
8. 1 2
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TEST WITH ENGINE RUNNING AT
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1 0 AMP ALTERNATOR SYSTEM
RPM - NO LOAD
3600
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 - - Check for defective stator o r rectifier - regulator
( Test C) .
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B-1 - - Indicates alternator system O K , battery was
fully charged .
B-2 -- Check for defective stator or rectifier - regulator
( TEST C) .
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 O K . Battery unable to hold charge .
Check specific gravity of battery . Replace If neces­
sary .
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