Will this voltage regulator rectifier fit my Kawasaki Ninja 300, 650, Z750S, or Z1000?

This voltage regulator rectifier is designed to fit various Kawasaki models including Ninja 300, Ninja 650, Z750S, and Z1000. To confirm compatibility with your bike, check that the original part number matches 21066-0732, 21066-0705, or 21066-0030. Compare your existing regulator's connectors to those shown in the product images for extra peace of mind.

How do I check if this voltage regulator is the right replacement for my bike?

You can verify compatibility by checking your current voltage regulator for the OEM part number (it should match 21066-0732, 21066-0705, or 21066-0030). Also, inspect the connector type and wiring on your bike to make sure they match the photos in this listing. If your Kawasaki is a Ninja 300, 650, Z750S, or Z1000 and the part numbers match, it should fit perfectly.

Is the installation of this regulator rectifier easy, or do I need a mechanic?

Most riders with basic tools can install this voltage regulator rectifier by themselves, as it’s designed as a direct replacement. Simply disconnect the battery, remove your old regulator, match the connectors, and bolt the new one in place. However, if you’re not comfortable working with motorcycle electrical systems, we recommend having a professional mechanic handle the installation for safety and optimal performance.

What issues or symptoms does replacing the voltage regulator solve on my Kawasaki?

A faulty voltage regulator can cause problems like battery not charging, flickering lights, fluctuating voltmeter readings, or difficulty starting your Kawasaki. Replacing a bad regulator with this upgraded unit helps maintain steady charging, protects your battery from overcharging, and keeps your electrical system running reliably—boosting overall riding confidence.

Does this voltage regulator rectifier come with a warranty?

Yes, this voltage regulator rectifier is backed by a warranty for your peace of mind. If you encounter any issues with reliability or fitment, simply reach out to us and our support team will assist with a replacement or solution to keep your Kawasaki on the road.

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Kawasaki Ninja 300 650 Z750S Z1000 Voltage Regulator Rectifier | Replaces 21066-0732 / 21066-0705 / 21066-0030

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$27.99

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Product Overview

Restore stable charging performance with this voltage regulator rectifier, designed for selected Kawasaki Ninja, Z, and Versys applications.

Built to replace this 21066-series OEM family, this unit helps solve common issues such as battery not charging, unstable voltage, dim or flickering lights, weak electrical output, and intermittent charging failure.

Constructed for dependable aftermarket replacement use, this rectifier regulator is intended to provide stable output, reliable heat handling, and long service life.

Product Compatibility

Brand	Model	Engine / HP / CC	Year Range	Notes
Kawasaki	Ninja 300 EX300	300cc	2013–2017	Verify OEM number and connector style before purchase
Kawasaki	Ninja 650R EX650	650cc	2006–2011	Verify OEM number and connector style before purchase
Kawasaki	Ninja 650 EX650	650cc	2014–2016	Verify OEM number and connector style before purchase
Kawasaki	ER-6N ER650	650cc	2009–2010	Verify OEM number and connector style before purchase
Kawasaki	Versys 650 KLE650	650cc	2008–2012	Verify OEM number and connector style before purchase
Kawasaki	Z750S ZR750	750cc	2005–2006	Verify OEM number and connector style before purchase
Kawasaki	Z1000 ZR1000	1000cc	2003–2008	Verify OEM number and connector style before purchase

OEM Cross Reference:
21066-0732, 21066-0712, 21066-0705, 21066-1127, 21066-0030, 21066-0717

Specifications

Specification	Details
Part Type	Voltage Regulator Rectifier
Voltage	12V
Weight	320 g
Plug Style	Please match with original part before ordering
Material	Premium replacement construction
Performance	Stable output / improved thermal handling / long service life
Condition	100% New Aftermarket

Key Features

OEM-Family Replacement Design – Built around Kawasaki regulator family 21066-0732 / 0712 / 0705 / 1127 / 0030 / 0717
Stable Voltage Regulation – Helps maintain reliable battery charging and electrical-system performance
Durable Construction – Built for dependable long-term use in motorcycle charging systems
Improved Thermal Performance – Designed to handle regular road use and engine-bay heat
Straightforward Replacement – Best suited to correctly matched applications using the same OEM family

Common Problems This Part Can Help Solve

This product may help address issues such as:

Battery not charging
Unstable charging voltage
Dim or flickering lights
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, and original part layout before ordering.

This listing is designed for selected Kawasaki applications using the 21066-series regulator rectifier family. Compatibility may vary by model year and market version, so matching by OEM number and connector style is strongly recommended before purchase.

If you are unsure about compatibility, contact us with your model, year, OEM number, and 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 motorcycle ready for daily use.