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Description
25 403 45-S Regulator Rectifier Kit (12/15 Amp) Kohler – Genuine OEM Replacement Part
The Kohler 25 403 45-S Regulator Rectifier Kit (12/15 Amp) is a genuine OEM replacement charging system component designed for select Kohler small engines. This regulator/rectifier kit is responsible for converting alternator output into usable DC voltage while regulating the electrical current to properly charge the battery and power engine electrical systems.
Commonly replaced when charging issues occur, this OEM kit ensures correct fit, durability, and dependable performance in outdoor power equipment applications.
Product Details
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Manufacturer Part Number: 25 403 45-S
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Brand: Kohler
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Part Type: Regulator Rectifier Kit
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Output Rating: 12/15 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 45-S Regulator Rectifier Kit is designed to:
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Convert alternator AC output into DC voltage
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Regulate charging current to prevent overcharging
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Maintain proper battery charging and electrical performance
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Replace faulty or damaged regulator/rectifier units
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Support reliable engine electrical operation
Compatibility
This OEM regulator rectifier kit 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
⚠️ Always verify your engine model and specification number before ordering to ensure correct fitment.
Installation / Usage
The regulator/rectifier installs within the engine’s charging system and connects to the alternator and battery circuit. Replacement is recommended if experiencing:
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Battery not charging properly
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Electrical system voltage fluctuations
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Dead battery after operation
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Faulty alternator charging output
For best results:
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Inspect wiring and connectors before installation
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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 connections clean and corrosion-free
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Inspect charging system components regularly
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Replace damaged regulators promptly to prevent battery failure
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OEM parts ensure proper voltage regulation and durability
