SMP Relay Switch - Starter & Brake Relay W/Diode

SMP relay switch for V-twin motorcycles, handling both starter and brake circuits with integrated diode protection. Direct OE-style replacement built for consistent, reliable starting performance.

Features

• Direct OE-style replacement design
• Integrated diode protection
• Heavy-duty brightly finished case
• Reliable long-life performance

Specifications

• Brand: SMP
• Manufacturer Part #: MCRLY4
• UPC: 091769325428
• Length: 4.3 in
• Width: 2.4 in
• Height: 1.5 in
• Weight: 0.12 lbs
• Country of Origin: China (Mainland)

Fitment

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

Frequently Asked Questions

Is this a direct replacement for the OEM relay?

Yes — this SMP relay is designed as a direct OE-style replacement for V-twin motorcycle starter and brake relays.

What does the diode protect against?

The integrated diode suppresses voltage spikes in the electrical circuit, extending the life of your relay and related components.

Will this improve my starting?

It restores reliable, consistent starting performance when replacing a worn or faulty original relay.

What bikes does this fit?

V-twin motorcycles including Harley-Davidson and Indian models. Verify your specific year and model before ordering.