This is a brand new aftermarket voltage regulator rectifier for the Honda TRX 300 Fourtrax and TRX 300 FW Foreman built between 1993 and 2000. It is a direct replacement to your original unit, so installation is plug-and-play with no assembly required.
The regulator rectifier converts the alternating current produced by the stator into direct current and holds the charging voltage steady, so the battery is charged correctly and the rest of the electrical system is protected from over-voltage. This unit is made with components that exceed OEM quality standards and is rated at 50 A / 500 W maximum charging current, giving it a substantial margin over the demands of a TRX 300 charging system. It is a five-wire, five-pin unit across three plugs, with leads of 180 mm and 420 mm and mounting holes 66 mm apart, matching the original layout.
Key Features
- Brand new aftermarket voltage regulator rectifier
- Direct replacement to your original unit
- Plug-and-play installation, no assembly required
- Components exceeding OEM quality standards
- Rated at 50 A / 500 W maximum charging current
- Five wires and five pins across three plugs
- Leads of 180 mm and 420 mm
- 66 mm mounting hole spacing, centre to centre
- RMSTATOR part number RM30116
Technical Specs
| Specification |
Detail |
| Part Number |
RM30116 |
| Width |
78 mm |
| Length |
80 mm |
| Height |
30 mm |
| Wire Lengths |
180 mm and 420 mm |
| Distance Between Fixation Holes |
66 mm centre to centre |
| Number of Plugs |
3 |
| Number of Pins |
5 |
| Number of Wires |
5 |
| Minimum Charging Voltage |
14.5 V +/- 0.5 V |
| Maximum Charging Current |
50 A / 500 W |
| Open Circuit Voltage |
Under 15 V |
| Operation Temperature |
-20 C to 85 C |
Vehicle Fitment Guide
| Make & Model |
Years |
| Honda TRX 300 Fourtrax |
1993-2000 |
| Honda TRX 300 FW Foreman |
1993-2000 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 31600-HC5-970 |
Honda |
| 31600-HM5-630 |
Honda |
Frequently Asked Questions
Will this fit without modification?
Yes. It is a direct replacement for the original regulator rectifier on the TRX 300 and TRX 300 FW of 1993 to 2000, with the same five-wire arrangement and 66 mm mounting hole spacing, so no cutting, splicing or drilling is required.
What is included?
The voltage regulator rectifier unit with its three plugs and leads of 180 mm and 420 mm.
How do I know my old regulator has failed?
Typical symptoms are a battery that will not hold charge, charging voltage at the battery terminals that stays low or climbs above 15 V with the engine running, a battery that boils or swells, and bulbs that keep blowing. Measure across the battery with the engine running and compare with the 14.5 V +/- 0.5 V figure in the specification table.
Does it fit both the TRX 300 and the four-wheel-drive TRX 300 FW?
Yes. Honda used the same regulator rectifier across the two-wheel-drive Fourtrax and the four-wheel-drive TRX 300 FW Foreman for 1993 to 2000. Cross-check the number on your original unit against 31600-HC5-970 or 31600-HM5-630 before ordering.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
