Chern Yueh 3-Position Chrome Ignition Main Switch for 1977+ Harley 71425-77 OEM Replacement with Two Keys

Chern Yueh's chrome 3-position ignition main switch (OEM 71425-77 replacement) is a direct-fit ignition switch for many 1977-up Harley-Davidson Sportster, Evolution and Softail motorcycles, supplied with two keys for convenient installation and use.

This heavy-duty ignition main switch is manufactured in Taiwan and engineered as a practical replacement for worn or missing original switches on classic Harleys. Designed with three rear terminals and a 3/4" diameter mounting slot, it supports common wiring configurations — Off, On, and On with Lights — and works well for OE restorations or custom electrical setups.

Which Harley models and years will this ignition switch fit?

The switch is compatible with a wide range of Harley-Davidson models from late 1970s through the 1990s. It fits FXS and FXS-80 (1977–1985), FX (1975–1985), FXR (1982–1994), and XL Sportster (1979–1993) model families when the bike accepts the 3/4" diameter ignition slot.

• Direct OEM replacement for part number 71425-77.
• Works with many Sportster, FX and FXR-era frames and consoles.
• Verify mounting hole size and terminal layout before purchase.

How is this switch wired and what electrical positions are available?

The switch has three rear terminals arranged to support standard motorcycle ignition wiring. It’s easily configured for basic Off and On functions, with an additional On-and-Lights position for accessories or original lighting circuits.

• 3 rear terminals for ignition and accessory feeds.
• Common wiring options: Off, On, and On with Lights.
• Can be adapted for custom harnesses or aftermarket accessories.

What comes in the box and how easy is installation?

Each unit ships with two cut-to-fit keys and the chrome-plated ignition body ready for mounting. Installation is straightforward for anyone comfortable with basic motorcycle wiring and dashboard removal; no special tools are required beyond typical hand tools and wire connectors.

• Includes two matching keys for spare convenience.
• Chrome finish for classic restoration appearance.
• Simple bolt-in replacement for standard 3/4" slot installations.

Is this a quality replacement and where is it made?

This ignition switch is produced in Taiwan and intended as a high-quality aftermarket alternative to aging OEM parts. It’s built to meet common fitment and function expectations for vintage Harley maintenance and customization projects.

• Manufactured in Taiwan (not made in China).
• Built to replace the original 71425-77 OEM switch.
• Chrome plating to match factory styling on restored bikes.

Who is this for: This Chern Yueh 3-position chrome ignition switch is aimed at vintage Harley owners, restoration shops, and custom builders who need a reliable, period-correct replacement part. It’s ideal if you’re restoring a late-70s to early-90s Sportster, FX, FXR or FXS model or updating electrical components during customization work. Verify your bike’s ignition slot diameter and terminal layout to ensure compatibility before ordering.