Voltage Regulator - Vespa GTS 250/300

Premium Vespa GTS Voltage Regulator

Stop letting a failing charging system cook your expensive battery or blow out your digital dashboard. This premium aftermarket voltage regulator rectifier acts as the critical gatekeeper of your scooter's electrical system, converting raw, erratic alternating current (A.C.) from the stator into stable, controlled direct current (D.C.). Engineered to match strict OEM voltage tolerances, it eliminates flickering headlights, dead batteries, and erratic idle dropouts.

Key Features

• OEM-Spec Voltage Management: Prevents damaging electrical spikes by capping system output to a steady, factory-regulated 14.5V range.

• Heavy-Duty Aluminum Heat Sink: Cast with deep cooling fins to rapidly dissipate internal heat, preventing the thermal burnout that plagues factory units.

• Plug-and-Play Wiring Harness: Includes the correct factory-matched connector block for a clean, secure hookup with no wire cutting or splicing.

• Overcharging Protection: Advanced internal circuitry isolates your battery from high-RPM stator surges, significantly extending battery lifespan.

Fitment Guide

Technical Specs

• Manufacturer Part Reference: High-Quality Aftermarket / Replaces OEM 641709, 639110, 58115R

• Component Type: Shunt-type Voltage Regulator Rectifier

• Output Voltage: 14.5V D.C. regulated standard nominal output

• Housing Material: Die-cast aluminum heat sink with sealed epoxy potting

• Package Contents: (1) Replacement Voltage Regulator Rectifier Assembly

Maintenance Note: A voltage regulator usually fails in one of two ways: it undercharges (battery drains down below 12V while riding), or it overcharges (voltage spikes past 15V, boiling the battery acid and blowing bulbs). If you notice a sulfur “rotten egg” smell under your seat, your regulator is dangerously overcharging.

Installation Tip: Clean, metal-to-metal contact is vital when bolting the new regulator to the scooter chassis. The regulator body needs a solid chassis ground to bleed off excess voltage safely; clean off any road grime or corrosion from the frame mounting tab before tightening the bolts.

Pro Tip: Before condemning your old regulator, always pull your stator cover plug and check the three yellow stator wires for continuity and grounding dropouts. A partially melted stator wire loom will mimic a bad regulator and can rapidly ruin your brand-new replacement unit if left unfixed!

WARNING: California Proposition 65