Original Yamaha NMAX 125 Rectifier & Regulator Assembly (4B4-H1960-01) | 2015-2020

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If your NMAX is experiencing battery drain or inconsistent charging, the rectifier regulator is a common failure point. This original Yamaha NMAX 125 rectifier and regulator assembly (4B4-H1960-01) restores proper current conversion and voltage control. Designed for accurate fitment and reliable performance, it eliminates issues caused by unstable electrical output. Replacing a worn unit ensures smooth and consistent charging performance.

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Guaranteed fitment for Yamaha GPD125-A NMAX or free returns.

Product Compatibility

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Part Number
  • 4B4-H1960-01
Alternative Part Number

_

Model
  • GPD125-A NMAX
Year
  • 2015
  • 2016
  • 2017
  • 2018
  • 2019
  • 2020
MFG
  • Yamaha

Product Overview

This high-quality Original Rectifier & Regulator Assy is designed to meet or exceed factory performance standards and is suitable for Yamaha NMAX 125 (2015-2020) models.

The rectifier and regulator assembly performs two essential functions in the motorcycle's electrical system: it converts the alternating current (AC) generated by the alternator into direct current (DC), and it regulates the output voltage to a safe level to prevent overcharging and protect the battery and electrical components. When the assembly fails, the result can be a chronically flat or swollen battery, erratic instrument readings, failure of lighting or ancillary electrics, or damage to sensitive control units caused by unregulated voltage. This original replacement restores the original charging and voltage regulation function, ensuring seamless, secure, and reliable operation of your NMAX 125.

• Brand New Original Rectifier & Regulator Assy
• Part Number: 4B4-H1960-01
• Original replacement for Yamaha NMAX 125 (2015-2020)
• Restores correct battery charging and regulated voltage output
• Protects the battery and electrical components from overcharging
• Direct fit, no modification required
• Ideal for charging system fault diagnosis and scheduled electrical maintenance
• London: Express same-day delivery (2-3 hours)
• Rest of UK: Same-day dispatch on orders before 1 PM (3-4 business days delivery).
• Up to 75% off for B2B Trade Accounts. Independent UK garages, apply now.

• Yamaha NMAX 125 owners with a flat battery, overcharging issue, or failing rectifier and regulator
• Replacing the Rectifier & Regulator Assy during charging system fault diagnosis or electrical repair
• Mechanics and workshops carrying out Yamaha NMAX 125 electrical system servicing
• Riders wanting to restore the original charging performance of their 2015-2020 NMAX 125
• Anyone looking for a guaranteed original replacement for their Yamaha NMAX 125

Complete Part Guide

When voltage isn't controlled properly, everything else starts to suffer. The original Yamaha NMAX125 Rectifier & Regulator Assembly (4B4-H1960-01) for 2015-2020 models converts AC power to DC and regulates it to safe levels for the battery and electrical system. It ensures smooth and consistent charging while preventing overvoltage damage. Built to Yamaha's original design, it delivers accurate performance, secure connections, and long-term reliability. Available now from Part Hive's London hub, order before 1 PM for same-day UK dispatch.

A typical issue we diagnose is unstable voltage output, either too high or too low. In the workshop, this is something we see regularly, especially on NMAX-125s with recurring electrical faults. Riders often try quick fixes like battery replacements or checking connections, but the root problem remains. The regulator loses its ability to control voltage properly. We replace it with this original Yamaha rectifier and regulator assembly unit and it restores accurate regulation, maintains proper system balance, and ensures everything runs within spec again.

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