What does a starter relay do?

A starter relay acts as an electrical switch. It uses a small current from the ignition switch to control a larger current that powers the starter motor, allowing your engine to crank over.

Does this relay come with any mounting hardware?

This starter relay is sold individually and does not include any additional mounting hardware or wiring harnesses. You will typically reuse the hardware from your original relay.

How do I know if my starter relay needs replacing?

If your starter motor isn't engaging when you turn the key, or if you hear a clicking sound without the engine cranking, a faulty starter relay could be the issue. This Twin Power relay is a direct replacement for the H-D 31506-79B.

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Est. 1957

Twin Power 80-E93 Big Twin and XL Starter Relay Replaces H-D 31506-79B

Specifications

Brand: TwinPower
Part #: 488751
UPC: 887337231495

Twin Power 80-E93 Big Twin and XL Starter Relay Replaces H-D 31506-79B

Name: Twin Power 80-E93 Big Twin and XL Starter Relay Replaces H-D 31506-79B
Brand: TwinPower
Price: 18.42 USD
Availability: InStock

$18.42

On Backorder — Expected to ship by May 3, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Twin Power 80-E93 Big Twin and XL Starter Relay Replaces H-D 31506-79B. A direct replacement for reliable starting.

Key Features

Fits a wide range of Harley-Davidson Big Twin and XL models.
Replaces Harley-Davidson part number 31506-79B.
Designed for reliable engagement of the starter motor.
Sold individually.

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Will this fit your vehicle?

Product Details

This Twin Power starter relay is built to replace the original H-D 31506-79B part, ensuring your Big Twin or XL motorcycle fires up reliably. It's designed to handle the electrical load needed to engage the starter motor, making it a crucial component for getting your ride going. Many Harley-Davidson models from the early 80s through the early 90s use this specific relay, covering a wide range of Electra Glides, Softails, and Sportsters.

When your starter isn't engaging, a faulty relay is often the culprit. This Twin Power unit is a well-built replacement that fits right into the factory location, simplifying the installation process. It's a straightforward swap that can get you back on the road without complex modifications. Having a dependable starter relay means less hassle and more time enjoying your ride.