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- 25 403 48-S Regulator Rectifier (20–30 Amp) Kohler – Genuine OEM Replacement Part
Description
25 403 48-S Regulator Rectifier (20–30 Amp) Kohler – Genuine OEM Replacement Part
The Kohler 25 403 48-S Regulator Rectifier (20–30 Amp) is a genuine OEM replacement charging system component designed for select Kohler small engines. This regulator/rectifier is responsible for converting alternator output into stable DC voltage while regulating electrical current to properly charge the battery and support engine electrical systems.
This higher-output unit (20–30 amp) is commonly used in engines with greater electrical demands and is replaced when charging system problems or voltage regulation issues occur.
Product Details
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Manufacturer Part Number: 25 403 48-S
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Brand: Kohler
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Part Type: Regulator Rectifier
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Output Rating: 20–30 Amp
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Application: Engine Charging & Electrical System
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OEM Status: Genuine Kohler OEM Replacement Part
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Condition: New
Function
The Kohler 25 403 48-S Regulator Rectifier is designed to:
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Convert alternator AC output into usable DC voltage
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Regulate electrical current to prevent battery overcharging
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Maintain consistent charging performance under load
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Replace faulty or damaged charging regulators
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Support reliable battery and electrical system operation
Compatibility
This OEM regulator/rectifier fits select Kohler small engines commonly used in:
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Riding lawn mowers
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Lawn tractors
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Zero-turn mowers
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Commercial outdoor power equipment
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Engines with higher electrical output requirements
⚠️ Always confirm your engine model and specification number before ordering to ensure correct fitment.
Installation / Usage
The regulator rectifier installs as part of the engine charging system and connects between the alternator and battery circuit. Replacement is recommended if experiencing:
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Battery not charging properly
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Voltage fluctuations or electrical failure
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Dead battery after operation
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Charging system warning symptoms
For best results:
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Inspect wiring harness and connectors before replacement
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Follow Kohler service manual installation procedures
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Use only genuine Kohler OEM electrical components
Maintenance Tips
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Keep electrical terminals clean and corrosion-free
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Inspect charging system output regularly
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Replace faulty regulators promptly to avoid battery damage
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OEM parts ensure correct voltage regulation and durability
