Regulator Rectifier for Honda CRF 450 X 2005-2017
Regulator Rectifier for Honda CRF 450 X 2005-2017
SKU:RMS020-103688
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Voltage Regulator Rectifier for Honda CRF 450 X
Honda CRF 450 X (CRF450X) 2005-2017 - replaces OEM 31600-MEY-671 - part number RMS020-103688
The regulator rectifier is the part of the charging system that turns the alternating current produced by the stator into the direct current your battery and electrical system actually run on, and then holds that output at a steady, safe level. It is a component that works hard every single time the engine runs, and on a hard-used enduro machine like the Honda CRF 450 X it lives a demanding life of heat, vibration and mud. When one begins to fail the symptoms are usually easy to spot: a battery that will not hold its charge overnight, lights that brighten and dim with engine speed, or a charging voltage that climbs high enough to cook the battery from the inside.
This is a brand new aftermarket voltage regulator rectifier, supplied as a direct replacement for the original unit and for Honda OEM part number 31600-MEY-671. It is plug-and-play and a direct fit, with easy installation and no assembly required. It is built using a higher grade of electrical components than the original equipment part, and every unit is tested before it is shipped. The body measures 55 mm long by 35 mm wide by 20.35 mm high and carries a single four-pin plug on a 160 mm wire tail, so it sits in the standard mounting position and connects straight into the existing loom with no cutting, splicing or adapters needed.
Key Features
- Brand new aftermarket unit, a direct replacement for Honda OEM 31600-MEY-671
- Plug-and-play and direct fit - no assembly, cutting or splicing required
- Built with a higher grade of electrical components than the original equipment part
- Single four-pin plug on a 160 mm wire tail to match the standard harness
- Regulated charging voltage of 14.5 V +/- 0.5 V
- Rated for up to 50 A / 500 W maximum charging current
- Open circuit voltage held below 15 V to protect the battery
- Rated for use from -20 C to 85 C
- Every unit is tested before it is shipped
Technical Specs
| Specification | Detail |
|---|---|
| Part Number | RMS020-103688 |
| Width | 35 mm |
| Length | 55 mm |
| Height | 20.35 mm |
| Wire Length | 160 mm |
| Number of Plugs | 1 |
| Number of Pins | 4 |
| Number of Wires | 4 |
| 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 Range | -20 C to 85 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 CRF 450 X (CRF450X) | 2005-2017 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number | Manufacturer / Brand |
|---|---|
| 31600-MEY-671 | Honda |
Frequently Asked Questions
Will this fit my CRF 450 X without modification?
Yes. This is a direct replacement for the original unit, supplied plug-and-play and direct fit with no assembly required. It uses the same single four-pin plug on a 160 mm wire tail as the standard harness, so no cutting, splicing or adapter looms are involved. Before ordering, check that the number on your existing regulator rectifier is 31600-MEY-671.
What is included?
You receive the RMS020-103688 voltage regulator rectifier unit itself, tested before dispatch. Because it plugs into the bike's existing four-pin harness connector, no adapters or extra wiring are supplied or needed.
How can I tell that my old regulator rectifier has failed?
The quickest check is to measure DC voltage across the battery terminals with the engine running. A healthy charging system should settle around 14.5 V, give or take half a volt. A reading well below that means the system is undercharging and the battery will slowly go flat; a reading above 15 V means it is overcharging, which cooks the battery and can damage bulbs and electronics. Lights that visibly brighten and dim with engine speed, a battery that needs charging after every ride, or a discoloured or melted plug at the regulator are all common signs of a unit that is on its way out.
What does the 50 A / 500 W rating mean in practice?
That figure is the maximum charging current and power the unit is built to handle. It is well above what a standard CRF 450 X charging system produces, which means the regulator rectifier is not being asked to work at its limit in normal use - useful headroom on a bike that may also be running auxiliary lighting or heated kit.
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