HD Switch AM107421 Starter Improvement Relay Kit with LED for Kawasaki, Onan, John Deere

Upgrade Your Starting Experience

If your machine only delivers a click when you turn the key, this HD Switch AM107421 Starter Improvement Relay Kit with LED is designed to help bring more decisive start power to the starter. The built-in LED indicator clearly signals when the relay is engaged, making it easier to diagnose and troubleshoot right at the source rather than guessing at the problem.

Engineered to be a practical and DIY-friendly upgrade, the kit provides a simple path to a steadier start sequence. The LED light not only confirms activation but also acts as a quick visual check during servicing or routine maintenance. The result is a more confident starting experience in everyday use, whether you’re in a workshop, out on the field, or behind the garage door during a chilly morning.

Key Benefits

• Addresses the common starting symptom of just hearing a click by improving current delivery to the starter
• LED indicator confirms when the relay is active for fast, visual troubleshooting
• Water-tight, sealed relay and connector wiring harness designed for durability in demanding environments
• DIY installation with included mounting hardware and step-by-step instructions
• Wide compatibility with Kawasaki riders (except 9hp), Onan and Kohler engines with starter-mounted solenoids
• Not compatible with Briggs & Stratton engines or remote-mounted solenoids

Compatibility and Real-World Use

The kit covers a broad range of John Deere equipment and other compatible configurations, including models in the 130–345 series and several F-series, GX, SX, SRX, and STX lines. In practice, it’s suited for machines where the solenoid sits on the starter, providing a practical upgrade path without modifying the existing wiring harness beyond the kit’s connector interface.

For technicians and riders who value clear diagnostics, the LED is a practical addition. It provides a visible cue during startup, which can speed up the identification of electrical or connection issues, helping you get back to work or play with less downtime.

What’s Included

• Installation Instructions
• Upgraded water-tight relay connector
• Sealed relay
• Wiring harness
• Mounting hardware