This alternator is a direct OEM-fit replacement for Honda BF115, BF135 and BF150 outboard engines. It is a 12 volt, 55 amp unit with clockwise rotation, built on a 4-groove serpentine pulley with a 62mm outside diameter to match the original fitment.
The unit is internally regulated (IR) with an internal fan (IF), using the original square plug connector and terminal layout so it fits in place of the factory unit with no wiring changes.
Key Features
- 12V, 55 Amp output
- Clockwise rotation
- 4-groove pulley (S4 class), 62mm OD
- Internally regulated with internal fan
- Square plug connector matching original terminal layout
Technical Specs
| Specification |
Detail |
| Voltage |
12V |
| Amperage |
55A |
| Rotation |
Clockwise (CW) |
| Pulley |
4-groove (S4 class), 62mm OD |
| Regulator |
Internally regulated (IR), 026000-3810 |
| Fan Type |
Internal (IF) |
| Connector |
Square plug |
Vehicle Fitment Guide
Years shown are the overall coverage span for this part. Please confirm against the OEM part number on your original unit before ordering.
| Make & Model |
Years |
| Honda BF115 |
2011-2019 |
| Honda BF135 |
2004-2019 |
| Honda BF150 |
2004-2019 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 31630-ZY6-003, 31630-ZY6-013, CGM25 |
Honda |
| 101211-8740 |
Denso |
| AND0537 |
Arrowhead |
| 12756 |
Lester |
Frequently Asked Questions
Will this alternator fit my outboard without modification?
Yes, it is built to the original Honda BF135/BF150 specification and fits using the factory mounting points, pulley and plug.
What is included?
One complete alternator unit, ready to fit.
How do I know my old alternator has failed?
Signs include a charging warning light on the gauge, low battery voltage, or the battery failing to hold charge after a run.
Does this replace the regulator as well?
Yes, this is a complete unit including its regulator, so no separate regulator purchase is needed.
My BF115 is older than 2011 — is this the right unit?
No. BF115 outboards built from 1999 to 2010 use the earlier 31630-ZW5-003 alternator, which we list separately.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
