SMP Relay Switch

SMP relay switch for V-twin motorcycles, engineered as a direct OEM-style replacement to restore reliable electrical function and consistent starting performance. Built with heavy-duty construction and a bright-finished case.

Features

• Direct OEM-style replacement
• Consistent starting performance
• Heavy-duty brightly finished case
• Compact design fits most V-twin mounts

Specifications

• Brand: SMP
• Manufacturer Part #: MCRLY6
• UPC: 091769510527
• Length: 2.7 in
• Width: 3.9 in
• Height: 1.7 in
• Weight: 0.07 lbs
• Country of Origin: China (Mainland)

Fitment

Fits V-twin motorcycles, including Harley-Davidson and Indian Motorcycle models.

Frequently Asked Questions

How do I know if my relay switch needs replacement?

Signs include no-crank starting issues, intermittent starting, or clicking sounds when turning the key. If the battery is good, a faulty relay is the next suspect.

Is this a direct bolt-in replacement?

Yes — this is an OEM-style replacement designed to fit existing relay mounts on V-twin bikes without modification.

What's the difference between this and a starter solenoid?

The relay switch controls electrical power to the starter motor circuit, while the solenoid is part of the starter itself. They work together to crank the engine.

Will this improve starting on a stock bike?

This relay restores reliable starting when the original has failed. On a healthy electrical system, it will not add performance.