For Honda TRX400EX Sportrax 400 1999-2004 ATV Starter Relay Solenoid New

Starter Relay Solenoid for Honda Sportrax 400 TRX400EX

This starter relay solenoid is a direct-fit electrical replacement that delivers the high-current switching needed to crank the Sportrax 400 TRX400EX engine reliably, and it is built to match the OEM relay used across 1999 through 2004 model years.

Overview

This starter relay solenoid for Honda is the heavy-duty switch that routes battery power straight to the starter motor when you press the start button. It is made for riders maintaining a Honda Sportrax 400 TRX400EX who need a dependable replacement without paying dealer prices. Whether your original relay has gone silent or only clicks, this TRX400EX starter relay solenoid gets the 400EX turning over again.

Built For Performance

• Heavy-gauge copper internal contacts handle the starter motor's high inrush current
• Sealed housing resists mud, water splash, and trail dust
• Plug-and-play terminal layout matches the factory connector and mounting points
• Rated for repeated start cycles on a 400cc single-cylinder ATV engine
• Coil winding engineered for consistent engagement across a wide temperature range
• Compact body that clears the factory battery box and wiring harness

Fits These Machines

• for Honda Sportrax 400 TRX400EX 1999
• for Honda Sportrax 400 TRX400EX 2000
• for Honda Sportrax 400 TRX400EX 2001
• for Honda Sportrax 400 TRX400EX 2002
• for Honda Sportrax 400 TRX400EX 2003
• for Honda Sportrax 400 TRX400EX 2004

On-The-Job Use

• Trailside replacement when the ATV will not crank in the middle of a ride
• Scheduled maintenance refresh on a high-hour Sportrax 400
• Restoring a stored or project TRX400EX to running condition
• Keeping a spare relay in the toolbox for race day or group rides

Specs At A Glance

Good To Know

Q: How do I know the relay is the problem and not the starter? A: A single loud click with no crank often points to the relay, while a slow grind usually points to the starter or battery. Test for voltage at the starter terminal while pressing the start button to confirm.

Q: Do I need to change any wiring to install it? A: No, this relay is designed to connect using the factory plug and mounting position. Reuse the original hardware and check that the battery cables are clean and tight before starting.

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