This is a brand new Mosfet three phase voltage regulator rectifier, supplied as a direct replacement for the original unit fitted to the Honda RVT 1000 RC 51 and the Honda VFR 800 Interceptor built between 2000 and 2009. It is a plug-and-play, direct fit part, so no assembly and no modification to the wiring loom are required. Every unit is tested before it leaves the warehouse.
Mosfet technology is the reason to change. This regulator runs cooler than all OEM diode style regulators, and it carries overheat protection - rather than burning up, it simply turns off for a while and cools down. The heat sink and the charging capability are both improved over the original, and higher grade electrical components are used throughout, so the quality exceeds the OEM equipment. The redesigned part does not have the black wire that is a common ground and is not required. The opposite connector for the main harness side is included, because that connector is very often melted, corroded or defective on a bike that has already cooked one regulator, and it is a major cause of repeat electrical faults.
Key Features
- Mosfet three phase design that runs cooler than OEM diode style regulators
- Overheat protection - the unit switches off and cools rather than burning out
- Direct replacement for the original unit, plug-and-play, no assembly required
- Improved heat sink and improved charging capability
- Higher grade electrical components, quality exceeds the OEM equipment
- Opposite connector for the main harness side included
- Redesigned without the black common ground wire, which is not required
- Every unit tested before shipping
Technical Specs
| Specification |
Detail |
| Part number |
RM30505H |
| Type |
Mosfet 3 phase voltage regulator rectifier |
| Width |
92 mm |
| Length |
94 mm |
| Height |
32 mm |
| Fixation holes, centre to centre |
80 mm |
| Number of plugs |
2 |
| Number of pins |
7 |
| Minimum charging voltage |
14.5 V +/- 0.5 V |
| Maximum charging current |
50 A / 500 W |
| Open circuit voltage |
Less than 15 V |
| Operating temperature |
-20 to 85 degrees C |
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 RVT 1000 RC 51 |
2000-2009 |
| Honda VFR 800 Interceptor |
2000-2009 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 31600-MCW-D01 |
Honda |
| 31600-MCW-D61 |
Honda |
| 31600-MCW-D60 |
Honda |
| 31600-MBG-306 |
Honda |
| 31600-MBG-D01 |
Honda |
| 31600-MBG-D00 |
Honda |
| 31600-MCF-D30 |
Honda |
| 31600-MCJ-640 |
Honda |
| 31600-MBW-A10 |
Honda |
Frequently Asked Questions
Does this fit without modification?
Yes. It is a direct replacement for the original unit and installs plug-and-play, with no assembly and no cutting or splicing of the loom. The mounting holes are 80 mm centre to centre, matching the original mounting position.
What is included?
The Mosfet regulator rectifier itself, plus the opposite connector for the main harness side. That connector is included because it is so often melted or corroded on a machine that has already lost a regulator.
How do I know my old regulator has failed?
Measure the charging voltage at the battery with the engine running. A healthy system holds around 14.5 V. A reading that stays near battery voltage points to a regulator that is no longer charging, while a reading well above 15 V points to a regulator that is no longer regulating and is boiling the battery. Burnt or discoloured connector pins are another common sign.
Why is there no black wire on this unit?
The part has been redesigned. The black wire on the original was a common ground that is not required, so it has been left off. This does not affect fitment or operation.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
