31630-ZY3-013 Honda Alternator | Genuine Used Part

🔧 Product Description

Genuine Honda BF175 / BF200 / BF225 / BF250 12-Volt 90-Amp Alternator - Part Number: 31630-ZY3-013

A genuine used Honda 90-amp alternator for selected V6 four-stroke outboards.

The internally regulated Denso-style alternator uses a six-groove serpentine pulley and supplies charging current for the engine, battery and onboard electrical systems. Honda diagrams show 31630-ZY3-013 on BF200 and BF225 engines, and aftermarket application catalogues extend the same alternator family to selected BF175 and BF250 models.

⚙️ Key Features

• Genuine Honda 12-volt alternator
• 90-amp rated output
• Correct Honda reference 31630-ZY3-013
• Six-groove serpentine pulley
• Extensive Denso, Sierra and electrical-industry cross references

🚤 Compatibility

Commonly used on

• Honda BF175 V6 outboards
• Honda BF200 V6 outboards
• Honda BF225 V6 outboards
• Selected Honda BF250 V6 outboards using this alternator family

Typically suits

• Engine models:
• Honda BF175A2, A3 and A6
• Honda BF175AK-series
• Honda BF200A2, A3 and A6
• Honda BF200AK-series
• Honda BF225A2, A3, A5 and A6
• Honda BF225AK-series
• Selected Honda BF250A engines where the fitted alternator cross-references to 31630-ZY3-013
• HP Range: 175HP - 250HP
• Engine Type: Honda V6 four-stroke EFI outboard
• Year Range: Approximately 2002-2019, dependent on model

🔌 Function

The alternator generates electrical power while the engine is running, recharges the battery and supports ignition, EFI, trim and onboard electrical loads.

⚠️ Common Signs of Failure

• Battery voltage does not rise with the engine running
• Battery repeatedly becomes discharged
• Charging warning or diagnostic code appears
• Headlights or electronics fluctuate with rpm
• Bearings become noisy
• Pulley or belt runs out of alignment
• Alternator overheats
• Charging voltage is excessively high
• Internal regulator or rectifier fails

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 31630-ZY3-013 → Replaces 31630-ZY3-003
• 31630-ZY3-003 earlier Honda alternator reference

OEM / Related Numbers

• Honda: 31630-ZY3-013
• Honda: 31630-ZY3-003
• Denso: 102211-2750
• Arrowhead: AND0538
• J & N Electrical: 400-52192
• DB Electrical: 400-52192
• Lester: 12757
• Cross-reference: CJX75
• Rotor assembly: 31631-ZY3-003

Aftermarket / Verified Equivalents

• Sierra: 18-6409
• Recmar: REC31630-ZY3-003
• DB Electrical: 400-52192
• Arrowhead: AND0538
• Denso: 102211-2750
• Panimax / aftermarket reference: 1752
• OEG and other marine replacements sold under Lester 12757

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated