SMP Relay Switch

SMP relay switch for V-twin motorcycles, engineered as a direct OE replacement to restore reliable starting performance. Built with a heavy-duty brightly finished case and proven relay internals trusted by Harley-Davidson and Indian Motorcycle riders.

Features

• Direct OE style replacement
• Reliable starting performance
• Heavy-duty brightly finished case
• High performance relay internals

Specifications

• Brand: SMP
• Manufacturer Part #: MCRLY9
• UPC: 727943131850
• Length: 2.65 in
• Width: 3.9 in
• Height: 2.2 in
• Weight: 0.02 lbs
• Country of Origin: Japan

Fitment

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

Frequently Asked Questions

Will this relay work on my Harley?

Yes — this is a direct OE replacement designed for Harley-Davidson V-twin engines and compatible Indian Motorcycle platforms.

What does a relay switch do?

The relay controls the electrical path to the starter motor, enabling reliable cranking even at low battery voltage.

How do I know if my relay has failed?

Symptoms include a clicking sound when turning the key but no engine cranking, or intermittent starting trouble. A multimeter test can confirm relay failure.

Is this a direct bolt-in replacement?

Yes — uses OE mounting points and connectors, so installation requires no additional brackets or wiring modifications.