Mercury – Quicksilver 818999A2 Starter Solenoid Assembly | Mercury 30–60HP Outboards & MerCruiser Sterndrives | 818999A2

Overview

Dependable starts begin with the right electrical components. The Quicksilver 818999A2 Starter Solenoid Assembly is built to factory standards for Mercury 30–60HP outboards and select MerCruiser sterndrive engines, ensuring consistent, reliable starting power in any condition.

This solenoid is engineered to handle marine-grade demands — high current loads, heat, vibration, and exposure to saltwater. If your starter is clicking, slow to crank, or failing to engage, this OEM solenoid is the simple, proven fix that gets you back on the water fast.

Key Features

• Purpose: Transfers power from the battery to the starter motor for reliable engine starts.
• Fitment: For Mercury 40HP and 30HP Jet outboards (Serial 0C100861–0C239552), 50–60HP outboards (Serial 0G290585–0G589999), and MerCruiser sterndrives including 500 EFI, GM 540 V8, 575 Sci, 420 V8, 425–525 V8, 600 SC, and 800 SC.
• Durability: Built to withstand marine heat, vibration, and salt exposure.
• Performance: Matches Mercury’s OEM specs for power transfer, reliability, and current handling.
• Note: Mounting hardware not included.

Engine & Boat Compatibility

• Mercury 30–60HP outboards
• Mercury Jet 30HP and Jet 45HP outboards
• MerCruiser sterndrives: 500 EFI, GM 540 V8 (1990–1996), 600 SC Bobtail (1998), 575 Sci, 420 V8 (1987–1989), 425–525 V8 (1990–1996), 600 SC (1991–1996), and 800 SC (1993–1998)
• Found on performance boats, cruisers, and inboard/outboard setups

Performance & Practical Benefits

The 818999A2 solenoid restores fast, consistent starting performance. When you turn the key, it instantly delivers the current your starter motor needs to spin the engine to life. The internal contacts are built to handle repeated use without sticking or pitting, and the housing is sealed to keep out moisture and corrosion.

You’ll notice more reliable starts and fewer electrical hiccups, even after long storage or in tough saltwater environments. It’s a small part with a big impact on keeping your boat dependable every trip.

Why Buy OEM

Mercury’s OEM solenoids are designed and tested specifically for marine use — with the right materials, resistance, and heat protection to stand up to the elements. Aftermarket solenoids often use weaker springs or unsealed casings that fail early under load.

A genuine Quicksilver solenoid guarantees exact fitment, safe operation, and long-term reliability. It’s the same high-quality component used in new Mercury and MerCruiser engines.

FAQ

Q1: What engines fit the Quicksilver 818999A2 solenoid?
A: It fits Mercury 30–60HP outboards (including Jet variants) and MerCruiser sterndrive engines listed above.

Q2: What does a starter solenoid do?
A: It channels battery power to the starter motor when you turn the key, allowing the engine to crank.

Q3: Can I install it myself?
A: Yes. It’s a straightforward bolt-on replacement that installs easily with common tools.

Q4: Does it come with hardware?
A: No, hardware must be purchased separately.

Q5: Why OEM instead of aftermarket?
A: OEM solenoids are sealed, tested, and built for marine conditions — aftermarket versions often aren’t.