This is a brand new aftermarket voltage regulator rectifier supplied as a direct replacement for the original unit fitted to the Suzuki RM Z 250 and RM Z 450. The regulator rectifier is the part of the charging system that converts the alternating current produced by the stator into direct current, and then holds that output at a stable level so the battery and the electrical system are never fed more voltage than they can handle. When it fails, the symptoms are usually a flat battery, a battery that boils or swells from overcharging, dim or flickering lights, or a machine that will not restart once it has been switched off.
Fitting is plug-and-play. The unit is a direct fit with no assembly required and no modification to the standard wiring loom - it uses a single four-pin plug on 90 mm wire tails and mounts on fixing holes 60 mm apart, matching the original. Higher grade electrical components are used throughout, so the quality exceeds the OEM equipment, and every unit is tested before it is shipped.
Key Features
- Direct replacement for the original unit
- Plug-and-play, direct fit, easy installation
- No assembly required
- Higher grade of electric components
- Quality exceeds the OEM equipment
- All products shipped are tested
- Single 4-pin plug on 90 mm wire tails
- Compact 76 x 44 x 22 mm body, 60 mm fixing hole centres
- Rated to 50 A / 500 W maximum charging current
Technical Specs
| Specification |
Detail |
| Part number |
RMS020-107255 |
| Component |
Voltage regulator rectifier |
| Width |
44 mm |
| Length |
76 mm |
| Height |
22 mm |
| Wires length |
90 mm |
| Fixation holes, centre to centre |
60 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 |
| Operation temperature |
-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 |
| Suzuki RM Z 250 (RMZ250) |
2008-2026 |
| Suzuki RM Z 450 (RMZ450) |
2008-2026 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 32800-28H00 |
Suzuki |
Frequently Asked Questions
Does this fit without any modification to the bike?
Yes. It is a plug-and-play direct fit with no assembly required, using the standard single four-pin plug and the original 60 mm fixing hole spacing. Nothing on the loom needs to be cut, extended or re-pinned.
How do I confirm this is the right part for my machine?
The most reliable check is the OEM number stamped on your existing unit - it should read 32800-28H00. It is also worth comparing the physical unit against the dimensions listed above: 76 mm long, 44 mm wide, 22 mm high, with the fixing holes 60 mm apart and four wires roughly 90 mm long.
How can I tell whether my old regulator rectifier has failed?
A working unit should hold the charging voltage at around 14.5 V, plus or minus 0.5 V, measured across the battery terminals with the engine running. A reading well below that means the battery is not being charged, while a reading climbing above roughly 15 V means the regulator is no longer limiting the output and will cook the battery. Repeated flat batteries after a ride are a common symptom.
Is this a genuine Suzuki part?
No. This is a brand new aftermarket replacement built to a higher grade of electrical components than the OEM equipment, and every unit is tested before dispatch. The Suzuki part number is listed for cross-reference only.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
