This is an advanced MOSFET type voltage regulator rectifier for the Moto Guzzi California Vintage 1100, Nevada 750 and V7 Special 750. MOSFET regulators run cooler than the OEM diode style units they replace, which is the single biggest reason original regulators on these machines fail. Rather than burning out under load, this unit has overheat protection built in: if it gets too hot it simply switches off for a while, cools down, and resumes.
Fitment is plug-and-play and direct. The body measures 110 mm wide by 85 mm long and 41 mm high, with the two fixation holes 80 mm apart centre to centre, so it sits on the original mounting points. It uses two plugs carrying six pins and six wires, with a 250 mm wire length. Charging voltage is held at a minimum of 14.5 V plus or minus 0.5 V, maximum charging current is rated at 50 A or 500 W, and open circuit voltage stays below 15 V. The unit is rated to operate between -20 C and 85 C. An additional connector for the main harness side is supplied with the regulator, because on machines of this age that connector is very often melted, corroded or otherwise defective.
Key Features
- Advanced MOSFET type regulator rectifier
- Runs cooler than OEM diode style regulators
- Overheat protection - switches off and cools rather than burning out
- Plug-and-play, direct fitment
- Additional main harness side connector included
- Two plugs, six pins, six wires
- 80 mm fixation hole spacing, uses the original mounts
Technical Specs
| Specification |
Detail |
| Part number |
RMS020-103870 |
| Type |
MOSFET |
| Width |
110 mm |
| Length |
85 mm |
| Height |
41 mm |
| Wire length |
250 mm |
| Fixation holes, centre to centre |
80 mm |
| Number of plugs |
2 |
| Number of pins |
6 |
| Number of wires |
6 |
| Minimum charging voltage |
14.5 V +/- 0.5 V |
| Maximum charging current |
50 A / 500 W |
| Open circuit voltage |
Less than 15 V |
| Operation temperature |
-20 C to 85 C |
Vehicle Fitment Guide
Please confirm against the OEM part number on your original unit before ordering.
| Make & Model |
Years |
| Moto Guzzi California Vintage 1100 |
2006-2012 |
| Moto Guzzi Nevada 750 |
2012-2013 |
| Moto Guzzi V7 Special 750 |
2012-2014 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 883878 |
Moto Guzzi |
Frequently Asked Questions
Does fitting a MOSFET regulator need any modification?
No. This is a plug-and-play, direct fitment part. The fixation holes are 80 mm apart, matching the original mounting, and it uses the same two plugs as the unit it replaces.
What is included?
The MOSFET regulator rectifier itself, plus an additional connector for the main harness side. That spare connector is included because on these bikes the harness side connector is often found melted, corroded or defective, and replacing it at the same time avoids repeating the fault.
How do I know my old regulator has failed?
Check the voltage at the battery with the engine running. The charging system should hold at least 14.5 V plus or minus 0.5 V. Persistent low readings, a battery that will not hold charge, or a reading above the 15 V open circuit limit all indicate the regulator. A regulator body that is scorched, or a harness plug that has melted, is a clear sign in itself.
What is the difference between MOSFET and the original diode regulator?
A diode style regulator dumps surplus charge as heat, which is why the original units run hot and eventually cook themselves. A MOSFET unit switches instead of shunting, so it runs considerably cooler, and this one adds overheat protection that shuts the unit down temporarily instead of letting it burn out.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
