Electrical System
114
62 690 05 Rev. HKohlerEngines.com
BATTERY CHARGING SYSTEM
CAUTION
Electrical Shock can cause injury.
Do not touch wires while engine is running.
NOTE: Observe following guidelines to avoid damage to
electrical system and components:
● Make sure battery polarity is correct. A negative (-)
ground system is used.
● Inspect charging system fuse. If damaged, replace
before continuing.
● Disconnect rectifi er-regulator plug (20/25 amp) or ring
terminals (optional high output) and/or wiring harness
plug before doing any electric welding on equipment
powered by engine. Also, disconnect all other
electrical accessories in common ground with engine.
● Prevent stator (AC) leads from touching or shorting
while engine is running. This could damage stator.
These engines are equipped with a 20/25 amp regulated
charging system (refer to pages 114-115) or an optional
high output 40/50 amp charging system (refer to pages
116-117).
20/25 Amp Regulated Charging System
C
E
F
B
A
D
A Battery B Starter C Fuse D Rectifi er-Regulator
E Connector Block F
Flywheel Stator
Assembly
Stator
Stator is mounted on crankcase behind fl ywheel. Follow procedures in Disassembly and Reassembly if stator
replacement is necessary.
Rectifi er-Regulator
Rectifi er-regulator is mounted on backing shroud assembly. To replace, disconnect plug, remove mounting screws,
and ground lead.
Troubleshooting Guide
20/25 Amp Battery Charging System
NOTE: Always zero digital volt-ohm meter (DVOM) on each scale before testing to ensure accurate readings. Voltage
test should be made with engine running at specifi c test condition noted. Battery should be checked for state
of charge (non-operating voltage 12.5 VDC or lower, battery should be charged or replaced).
When problems occur in keeping a battery fully charged or a battery charges at a high rate, battery or charging
system may be cause of fault. Before performing any testing, battery must be fully charged.
To test charging system:
1. Inspect charging system fuse. If damaged, replace before continuing.
2. Visually inspect system components and wiring. Look for damaged or loose wire connections, including battery
cables.
3. Set DVOM to DC volts, place one lead of tester on rectifi er-regulator body and other lead to battery negative (-)
terminal. Run engine and observe volt reading on meter. If voltage is 0.5 VDC or less continue with testing. If
voltage is higher than 0.5 VDC, inspect and repair wiring/connections as needed (insuffi cient ground).
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