Sierra NEW Switch Box CDI 18-5775 Replaces: 332-7778A6 50-300HP 3 6Cyl 0810

Sierra Switch Box (Power Pack / CDI Module) — Part Number 18-5775
Brand: Sierra | Condition: New Old Stock (NOS)

You are purchasing a new Sierra Switch Box (Power Pack / CDI Module), part number 18-5775, for Mercury and Mariner 3-cylinder and 6-cylinder 2-stroke outboard motors. This is a genuine Sierra branded part — never installed, never used.

Important Note: V6 engines require 2 switch boxes (one per 3-cylinder bank). This listing is for 1 unit.

Condition Details:

This is a New Old Stock (NOS) part. The switch box itself is in new, uninstalled condition. As is common with NOS inventory, the original packaging may show signs of age, including shelf wear, dust, or minor cosmetic blemishes on the bag or box. The part is new and fully functional.

Part Number / Supersede Information:

Primary Part Number: 18-5775
Replaces OEM Mercury: 332-7778A12, 332-7778A9, 332-7778A6, 332-7778A5, 332-7778A3, 332-7778A1, 332-7778, 332-5524, 332-5524A1
Cross-References: CDI 114-7778 | Mallory 9-25100

Fitment:

Fits Mercury / Mariner 3-cylinder and 6-cylinder 2-stroke outboards, approximately 1976–2000:

• 50HP (1986–1990) | 60HP (1984–1990) | 65HP (1976–1979)
• 70HP (1977–1993) | 75HP (1987–1993) | 80HP (1987–1989)
• 90HP (1979–1995) | 105HP Jet (1992–2000) | 115HP (1979–1989)
• 135HP (1985–1999) | 140HP (1979–1999) | 150/175/200HP (1978–1999)
• 225HP (1981–1993) | 250/275HP (1989–1994) | 300HP (1980–1987)
• Please verify fitment using your motor's model and serial number before ordering

Why Choose Quality Replacement Parts?

Sierra parts are engineered to meet or exceed OEM specifications, providing reliable performance and a precise fit for your Mercury or Mariner outboard. Every Sierra part is purpose-built for harsh marine environments and backed by Sierra's limited lifetime warranty covering defects in workmanship and materials.

Returns:

We proudly offer hassle-free returns. If you are not completely satisfied with your purchase for any reason, simply open a return request through eBay within 30 days of purchase and we will take care of you promptly.

Thank you for choosing QBS Parts Inc! We truly appreciate your business. If you have any issues whatsoever with your order, please give us the opportunity to resolve it before leaving feedback — we are committed to making every transaction a great experience. Please verify fitment using your motor's model and serial number before purchasing. Feel free to message us with any questions — we're here to help!

QBS Parts, Inc. — Gardena, CA