Honda Marine Alternator Assembly – Fits Honda BF115/BF130 HP V4 Outboards (Replaces 31630-ZW5-003)
Honda Marine Alternator Assembly – Fits Honda BF115/BF130 HP V4 Outboards (Replaces 31630-ZW5-003) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
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Honda Marine Alternator Assembly – Fits Honda BF115/BF130 HP V4 Outboards (Replaces 31630-ZW5-003) is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Honda Marine Alternator Assembly is designed for Honda BF115 and BF130 HP V4 4-stroke outboard engines from 1997 and newer. It serves as a reliable replacement to restore your engine's charging system to factory specifications.
It directly interchanges with Honda part number 31630-ZW5-003 and Sierra part number 18-6475.
- Engineered for direct OEM replacement and bolt-on fitting.
- Features standard OEM electrical connections for plug-and-play installation.
- Constructed with a durable alloy steel housing.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Honda | 31630-ZW5-003 |
| Sierra | 18-6475 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This alternator is compatible with a range of Honda V4 outboard engines. Please check your specific model and year against the list below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Honda | BF115A | 115 | 4-Stroke | 1999–2014 | 31630-ZW5-003 | V4 Engine |
| Honda | BF115A1, A2, A3, AX | 115 | 4-Stroke | 1997–Up | 31630-ZW5-003 | V4 Engine |
| Honda | BF130A | 130 | 4-Stroke | 1999–2004 | 31630-ZW5-003 | V4 Engine |
| Honda | BF130A1, A2, A3, A4, AX | 130 | 4-Stroke | 1997–Up | 31630-ZW5-003 | V4 Engine |
Technical Specs
- Product Type
- Alternator Assembly
- Installation
- Direct OEM Replacement
- Fuel Type
- Gasoline
- Connection
- OEM Electrical Connections
- Housing Material
- Alloy Steel
- Housing Color
- Black
- Dimensions
- 18.0" x 18.0" x 21.0"
- Fitting Type
- Direct Bolt-On
- Thread Size
- M6-1.0 for B+ Terminal
- Voltage
- 12V
- Amperage
- 55A
- Rotation
- CW
- Clock Position
- 7
- Pulley
- 4-Groove, 62mm OD
- Regulator
- IR
- Fan Type
- IF
What’s in the Box
- 1 x Alternator Assembly (31630-ZW5-003)
Installation Notes
- Disconnect the battery's negative terminal to prevent electrical shorts.
- Locate and identify the old alternator. Loosen the serpentine belt by releasing the tensioner.
- Remove the electrical connections from the back of the alternator, noting their positions.
- Unbolt and remove the old alternator from its mounting brackets.
- Compare the new alternator with the old one to ensure an exact match.
- Install the new alternator, tightening the mounting bolts to the manufacturer's torque specifications.
- Reconnect the electrical connections securely.
- Reinstall the serpentine belt and apply the correct tension.
- Reconnect the battery's negative terminal.
- Start the engine and verify the charging system is operating correctly using a voltmeter (voltage should typically be between 13.8V and 14.5V with the engine running).
Troubleshooting & FAQ
How do I know if my alternator is failing?
Common signs include a warning light on the dash, dimming headlights, a weak or dead battery, strange noises from the engine bay (grinding or whining), or the smell of burning rubber or wires.
Will this fit my Honda BF115AX model?
Yes, this alternator is compatible with Honda BF115A1, A2, A3, and AX models from 1997-Up, as well as several other BF115 and BF130 models. Always cross-reference your OEM part number (31630-ZW5-003) to be certain.
Is this a 12V or 24V alternator?
This is a 12-volt alternator with a 55-amp output, designed for the specified Honda outboard engines.
What is the difference between this aftermarket unit and the original Honda OEM part?
This part is functionally equivalent and built to meet or exceed original specifications for fit and performance. The primary difference is that it is not branded by Honda. It provides a reliable, cost-effective alternative.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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