Regulator Rectifier for Honda CB 1000, CB 750 Nighthawk, CBR 1000 & ST 1100 1990-2003
Regulator Rectifier for Honda CB 1000, CB 750 Nighthawk, CBR 1000 & ST 1100 1990-2003
SKU:RM30311
Free shipping over £150. Terms apply
Couldn't load pickup availability
Regulator Rectifier for Honda CB 1000, CB 750 Nighthawk, CBR 1000 & ST 1100
Honda CB 1000, CB 750 Nighthawk, CBR 1000 Hurricane and ST 1100 - 1990-2003
A brand new voltage regulator rectifier, part number RM30311, built as a direct replacement for the original unit fitted to the Honda CB 1000, CB 750 Nighthawk, CBR 1000 Hurricane and ST 1100 between 1990 and 2003. It is plug and play, requires no assembly and needs no modification to the wiring on the applications listed below - the single six pin plug matches the original connector, so the unit bolts on and plugs straight in.
The regulator rectifier does two jobs at once. It converts the alternating current produced by the stator into the direct current the motorcycle actually uses, and it holds that output at a steady level so the battery is charged without being overcharged. When the unit starts to fail you normally see one of two patterns. Either the battery is never properly topped up, the bike runs down after a few miles and eventually will not turn over, or the opposite happens and the charging voltage climbs too high, boiling the battery and blowing bulbs. This replacement is manufactured with a higher grade of electrical components than the original part, and every unit is tested before it is shipped.
Key Features
- Brand new aftermarket unit - not a remanufactured or rebuilt core
- Direct replacement for the original unit, plug and play, no assembly required
- Build quality exceeds the original equipment specification
- Higher grade electrical components throughout
- One plug with six pins, matching the factory connector on the listed models
- 60 mm fixation hole spacing, centre to centre
- Every unit is tested before it is shipped
- Dispatched from the UK with technical fitment support
Technical Specs
| Specification | Detail |
|---|---|
| SKU / Part Code | RM30311 |
| Component | Voltage Regulator Rectifier |
| Width | 44 mm |
| Length | 78 mm |
| Height | 19 mm |
| Fixation hole distance (centre to centre) | 60 mm |
| Number of plugs | 1 |
| Number of pins | 6 |
| Minimum charging voltage | 14.5 V +/- 0.5 V |
| Maximum charging current | 35 A / 400 W |
| Open circuit voltage | Under 15 V |
| Operating temperature | -20 C to 85 C |
| Condition | New aftermarket |
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 CB 1000 | 1990-2003 |
| Honda CB 750 Nighthawk | 1990-2003 |
| Honda CBR 1000 Hurricane | 1990-2003 |
| Honda ST 1100 | 1990-2003 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number | Manufacturer / Brand |
|---|---|
| 31600-MS2-601 | Honda |
Frequently Asked Questions
Do I need to modify anything to fit it?
No. On the models listed above this is a direct replacement for the original unit. It is plug and play, no assembly is required, and the six pin plug matches the factory connector so no adapters or cutting are needed.
What is included?
The regulator rectifier unit itself, carrying one plug with six pins to match the original connector on the listed models. It measures 78 mm long by 44 mm wide by 19 mm high, with 60 mm between the mounting holes, so you can compare it directly against the part you are removing.
How do I tell whether my old regulator rectifier has failed?
Measure the battery voltage with the engine running and warm. A healthy system on these models settles around 14 to 14.5 volts. A reading that stays down at battery voltage means the unit is not charging, and a reading climbing well above 15 volts means it has lost regulation and is overcharging. Check the stator output and the earth connections first, so that you are not replacing a good regulator because of a fault further upstream.
What does the 35 A / 400 W rating mean?
That is the maximum charging current this unit can handle continuously. It sets the ceiling on how much of the stator output the regulator can convert and pass to the battery and the electrical system. The minimum charging voltage is 14.5 V plus or minus 0.5 V, the open circuit voltage stays under 15 V, and the unit is rated to operate between -20 C and 85 C.
Share
