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Kawasaki ER-6N Ninja 650 Vulcan S Z1000 Regulator Rectifier | 21066-0732
Kawasaki ER-6N Ninja 650 Vulcan S Z1000 Regulator Rectifier | 21066-0732
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Product Overview
Restore stable charging performance with this voltage regulator rectifier, designed for selected Kawasaki ER-6N, Ninja 650 / 650R, Vulcan S 650, Z750, Z800, and Z1000 applications.
Built to replace selected Kawasaki 21066-series regulator rectifiers, including 21066-0712, 21066-0722, and 21066-0732, this unit helps solve common charging-system issues such as battery not charging, unstable voltage, dim or flickering lights, weak electrical output, and intermittent charging failure.
This regulator rectifier helps dissipate excess voltage, improve charging capability, and reduce the risk of battery overcharging. It is designed as a direct replacement for correctly matched applications and should be verified by OEM number, connector style, and physical dimensions before purchase.
Product Compatibility
| Brand | Model | Engine / HP / CC | Year Range | Notes |
|---|---|---|---|---|
| Kawasaki | ER-6N | 650cc | 2009–2011 | Verify OEM number and connector style before purchase |
| Kawasaki | Ninja 650R / 650 R | 650cc | 2006–2013 | Verify OEM number and connector style before purchase |
| Kawasaki | Vulcan S 650 EN650 | 650cc | 2015–2016 | Verify OEM number and connector style before purchase |
| Kawasaki | Z750 / Z750S | 750cc | 2005–2006 | Verify OEM number and connector style before purchase |
| Kawasaki | Z800 | 800cc | 2013–2016 | Verify OEM number and connector style before purchase |
| Kawasaki | Z1000 | 1000cc | 2003–2008 / 2010–2016 | Verify OEM number and connector style before purchase |
OEM Cross Reference:
21066-0712, 21066-0722, 21066-0732
Additional related 21066-series references sometimes seen:
21066-0705, 21066-1127, 21066-0030, 21066-0717
Specifications
| Specification | Details |
|---|---|
| Part Type | Voltage Regulator Rectifier |
| Mounting Hole Diameter | 14 mm / 0.55" |
| Mounting Hole Distance | 72 mm / 2.8" |
| Length | 94 mm / 3.7" |
| Width | 80 mm / 3.1" |
| Height | 28 mm / 1.1" |
| Fitment Method | Match by OEM number, connector style, and original part layout |
| Function | Voltage regulation and rectification |
| Condition | 100% New Aftermarket |
Key Features
- Stable Voltage Regulation – Helps maintain reliable battery charging and electrical-system output
- Overcharge Protection – Helps dissipate excess voltage and reduce the risk of battery damage
- Improved Charging Capability – Supports stable current flow for motorcycle electrical systems
- Direct Replacement Design – Designed for plug-and-play installation on correctly matched applications
- Durable Construction – Built for reliable performance and long service life
Common Problems This Part Can Help Solve
This product may help address issues such as:
- Battery not charging
- Battery overcharging
- Dim or flickering lights
- Unstable charging voltage
- Weak electrical output
- Intermittent charging failure
- Regulator overheating or voltage-control issues
Package Includes
1 × Voltage Regulator Rectifier
Fitment Note
Please confirm your OEM part number, connector style, mounting-hole spacing, and original part appearance before ordering.
If you are unsure about compatibility, contact us with your model, year, OEM number, connector photos, and original part photos before purchase.
Installation Note
Professional installation is recommended.
Before installation, inspect related components such as the battery, stator, wiring harness, connectors, and charging system to avoid repeat failure caused by another faulty part.
Why Choose This Replacement
A failing regulator rectifier can lead to poor charging performance, unstable voltage, dim lighting, and unreliable electrical operation. Replacing it with a properly matched unit helps restore dependable charging-system performance and keeps your Kawasaki motorcycle ready for daily riding.
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Fitment FAQ
Will this part fit my specific model and year?
This voltage regulator rectifier is intended for Engine / HP / CC. Listed year information includes 2009–2011, 2006–2013, 2015–2016, 2005–2006, 2013–2016. It is best matched to original part number(s) 21066-0712, 21066-0722, 21066-0732, 21066-0705. Key physical/spec details from the product data include Mounting Hole Diameter: 14 mm / 0.55", Mounting Hole Distance: 72 mm / 2.8", Length: 94 mm / 3.7". Use the compatibility table and product photos together before ordering.
Do I need to match the OEM part number?
Yes. Match your original part number to 21066-0712, 21066-0722, 21066-0732, 21066-0705 before purchase. For this voltage regulator rectifier, also compare the OEM number, plug shape, pin count, mounting-hole distance, heat-sink style, and AC/DC charging-system type. This is especially important for Kawasaki Z1000 models because similar model names can use different parts by year or trim.
What models or situations does this part not fit?
Do not order this voltage regulator rectifier for machines outside the listed compatibility, or for units with different pin counts, plug shapes, AC/DC system types, or mounting-hole spacing. If your original part number does not cross-reference with 21066-0712, 21066-0722, 21066-0732, 21066-0705, treat the fitment as unconfirmed. Model years outside 2009–2011, 2006–2013, 2015–2016, 2005–2006, 2013–2016 should be verified separately. Do not rely only on the model name or engine size.
What should I check before ordering?
Before ordering, compare your original part with the photos and check the OEM number, plug shape, pin count, mounting-hole distance, heat-sink style, and AC/DC charging-system type. Confirm OEM/cross-reference number(s): 21066-0712, 21066-0722, 21066-0732, 21066-0705. Recheck listed specs such as Mounting Hole Diameter: 14 mm / 0.55", Mounting Hole Distance: 72 mm / 2.8", Length: 94 mm / 3.7". If any connector, mounting point, size, or year detail is different, confirm fitment before installation.