A new aftermarket regulator/rectifier for Honda BF75 and BF90 outboards. It replaces Honda 31750-ZY9-003 and the matching Tohatsu number HZY931750003.
The regulator/rectifier converts the alternator coil's AC output to DC and limits charging voltage. When it fails the battery may go flat, or be overcharged, and gauges or electronics may behave erratically.
Delivery: 5-7 working days. This part is brought in from our European warehouse in Spain and is not held in our UK stock, so it ships separately from next-day items.
Key Features
- 100% new aftermarket regulator/rectifier
- Replaces Honda 31750-ZY9-003
- Also cross-references Tohatsu HZY931750003
- For Honda BF75 and BF90
Technical Specs
| Specification |
Detail |
| Component |
Regulator rectifier |
| Condition |
New aftermarket |
| Warranty |
12 months |
| Delivery |
5-7 working days |
Application / Fitment Guide
| Make |
Application |
| Honda |
BF75 |
| Honda |
BF90 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only and remain the property of their respective manufacturers.
| Part Number |
Manufacturer / Brand |
| 31750-ZY9-003 |
Honda |
| HZY931750003 |
Tohatsu |
Frequently Asked Questions
How do I confirm this regulator/rectifier fits my engine?
Match the part number stamped or printed on your old regulator/rectifier (or the number in your engine parts list) against the cross-reference table on this page. If the number is missing or unreadable, send us your engine model and serial number and we will confirm fitment before you order.
Why does delivery take 5-7 working days?
This part is shipped to us from our European warehouse in Spain rather than held on the shelf in the UK. We dispatch it to you as soon as it arrives.
How do I check the regulator/rectifier after fitting?
With the engine running at cruising rpm, measure voltage across the battery terminals; a healthy charging system normally reads roughly 13.5 to 14.5V. Make sure the mounting surface is clean so the unit can earth and shed heat, and that every connector is clean, dry and fully seated.
Delivery 5-7 working days · 12-month warranty · Fitment support from our technical team
