Mosfet Regulator Rectifier for Arctic Cat Bearcat & Triumph Bonneville Speedmaster 900 1996-2022
Mosfet Regulator Rectifier for Arctic Cat Bearcat & Triumph Bonneville Speedmaster 900 1996-2022
SKU:RMS020-103436
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Mosfet Regulator Rectifier - RMS020-103436
Arctic Cat Bearcat 1996-1999 and Triumph Bonneville / Speedmaster 900 2000-2022
This is a brand new MOSFET voltage rectifier regulator, designed to replace the traditional diode-style regulator fitted as standard to the Arctic Cat Bearcat and to the Triumph Bonneville and Speedmaster 900. MOSFET switching technology is the single biggest improvement available to a charging system of this era: the unit runs cooler than all OEM diode style regulators, which is the root cause of most original regulator failures on these machines. Less waste heat means less thermal stress on the internals, and a regulator that is not cooking itself is a regulator that holds its charging voltage year after year.
It is built as a direct, plug-and-play replacement. The unit uses the same single 5-pin plug and the same 80 mm fixing hole centres as the original, so it drops straight into the factory mounting position with no cutting, splicing or bracket modification. On top of the cooler-running MOSFET design it carries genuine overheat protection - rather than burn up it will simply turn off for a while and cool off, then resume charging - along with improved heat sink capabilities and a higher grade of electrical components throughout. It is supplied complete with the opposite connector (main harness side), so if your original loom plug is corroded, melted or has broken locking tabs you have everything needed to renew that side of the connection at the same time.
Key Features
- MOSFET design - runs cooler than all OEM diode style regulators
- Overheat protection - rather than burn up it will simply turn off for a while and cool off
- Plug-and-play, direct fit, easy installation
- Improved heat sink capabilities
- Higher grade of electrical components
- Rated to 50 A / 500 W maximum charging current
- Supplied with the opposite connector (main harness side)
- Replaces the traditional diode-style regulator
Technical Specs
| Specification | Detail |
|---|---|
| Part Number | RMS020-103436 |
| Width | 90 mm |
| Length | 90 mm |
| Height | 30 mm |
| Wire Length | 240 mm |
| Fixation Holes (Centre to Centre) | 80 mm |
| Number of Plugs | 1 |
| 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 | < 15 V |
| Operation Temperature | -20°C to 85°C |
Vehicle Fitment Guide
| Make & Model | Years |
|---|---|
| Arctic Cat Bearcat | 1996-1999 |
| Triumph Bonneville 900 | 2000-2022 |
| Triumph Speedmaster 900 | 2000-2022 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number | Manufacturer / Brand |
|---|---|
| 3430-037 | Arctic Cat |
| 3430-072 | Arctic Cat |
| 3430-016 | Arctic Cat |
| T1300889 | Triumph |
| T1300890 | Triumph |
| T1300888 | Triumph |
| T1300819 | Triumph |
Frequently Asked Questions
Will this fit without modification?
Yes. It is a plug-and-play, direct fit replacement on the models listed above. It uses the same single 5-pin plug, the same 5 wires and the same 80 mm fixing hole centres as the original, so it bolts into the factory position and connects to the factory loom. No cutting, splicing or bracket modification is needed.
What is included in the box?
You receive the MOSFET regulator rectifier unit itself plus the opposite connector - the main harness side plug. That spare connector lets you renew a corroded, melted or broken loom plug at the same time, which is a common failure point on machines that have already cooked one regulator.
How do I know my old regulator has failed?
The usual signs are a battery that will not hold its charge, dim or flickering lights, repeatedly blown bulbs, or a battery that is boiling and losing electrolyte from overcharging. The quickest test is to measure the voltage across the battery terminals with the engine running: a healthy system on these machines should be delivering around 14.5 V +/- 0.5 V. A reading that stays down at battery voltage, or one that climbs well above 15 V, points at the regulator.
Why choose a MOSFET unit over the original diode type?
A MOSFET regulator runs cooler than all OEM diode style regulators, and heat is what kills these units. It also has overheat protection built in - rather than burn up it will simply turn off for a while and cool off, then start charging again once temperature has dropped. Combined with the improved heat sink and the higher grade of electrical components, that makes it a genuine upgrade over the part it replaces rather than a like-for-like swap.
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