US Starter Relay Solenoid For Honda Fourtrax 300 400 TRX300EX TRX400EX ATV

Starter Relay Solenoid for Honda Fourtrax 300 400 TRX300EX TRX400EX ATV

This starter relay solenoid is a direct-fit electrical component that delivers the high-current switching needed to engage the starter motor on Honda Fourtrax 300 and 400 ATVs, including the TRX300EX and TRX400EX models.

Overview

This starter relay solenoid for Honda ATVs replaces a failed or weak relay so the starter motor cranks with full battery power. It is built for riders and mechanics servicing Fourtrax 300 and 400 machines, including TRX300EX and TRX400EX models, who need reliable starting at the push of a button. The compact sealed housing mounts in the stock location and connects to the factory wiring harness.

Built For Performance

• Heavy-duty copper contacts handle the high inrush current of ATV starter motors
• Sealed housing resists mud, water, and dust common on off-road machines
• Direct replacement footprint for the stock relay location
• Rated for repeated start cycles without contact pitting
• Standard blade terminals match the factory connector style

Fits These Machines

• for Honda Fourtrax 300
• for Honda Fourtrax 400
• for Honda TRX300EX
• for Honda TRX400EX

On-The-Job Use

• Trail riding and recreational ATV use
• Farm and ranch utility work
• Cold-weather starting when battery voltage sags
• Routine replacement during starter system diagnostics

Specs At A Glance

Good To Know

Q: How do I know if my starter relay solenoid is bad? A: Common signs include a single loud click with no crank, no response when pressing the start button, or voltage present at the relay but not at the starter. Testing the relay terminals with a multimeter confirms whether it is switching correctly.

Q: Does this relay require any wiring modification? A: It is designed to connect to the factory harness using the stock connector and terminal layout. If your original plug is damaged, inspect and repair the connector before installation.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.