BlueStars 12V Starter Solenoid Relay Replacement for Mercury/Force 89-817109A1/A2/A3 — Copper Contacts & Corrosion-Resistant

BlueStars 12V Starter Solenoid Relay is a direct-fit replacement solenoid engineered to reliably route battery power to the starter on Mercury and Force outboards listed by part numbers 89-817109A1/A2/A3 and equivalents.

This upgraded BlueStars solenoid is built for marine starting systems that demand clean, efficient power transfer and corrosion-resistant construction. It replaces several Mercury, Sierra, and aftermarket part numbers and fits a wide range of outboard engines from small 40 hp models up to V225 and V250 EFI applications. The unit uses copper windings, high-temperature coil materials, and a flame-retardant ABS housing to withstand salt, oil, and vibration commonly encountered in boating environments.

Will this solenoid fit my Mercury or Force outboard?

Compatibility covers many Mercury Marine and Force Marine engines across years and serial ranges. Check your existing part number or serial number ranges; the BlueStars relay replaces Mercury 89-817109A1/A2/A3 and related cross-references like 87-803632T and 89-F460917-1.

• Fits Force Marine 40–120 (1996–1999 serial ranges and newer where specified)
• Compatible with multiple Mercury models including V135–V250 EFI and V225 where listed
• Covers Sierra and Arco cross-reference part numbers such as 18-5834 and SW109

How does the BlueStars solenoid improve starting performance?

The unit transfers battery current to the starter with minimal voltage drop thanks to copper contacts and optimized windings. A clean, firm engagement reduces heat buildup and power loss so the starter receives a stronger initial burst of current, improving cranking consistency.

• Copper winding and contacts for stable conductivity
• High-temperature coil (180°C) and anti-oxidizing treatments
• Reduced electrical resistance for quicker, more reliable starts

What construction and durability features does this relay offer?

BlueStars designed the housing from flame-retardant ABS to resist oil, salt spray, and UV exposure, while internal copper elements are treated to limit oxidation. The overall build emphasizes corrosion resistance and mechanical resilience in wet, vibrating marine settings.

• ABS plastic housing resists chemicals, UV, and impact
• Copper coil and contacts with heat-safe and anti-oxidizing properties
• Sealed mounting points and robust terminal hardware for secure installation

Is installation straightforward and what should I check before replacing?

Installation is generally straightforward for anyone comfortable with basic electrical work and familiar with outboard starter layouts. Always disconnect the battery, compare terminal layout and mounting holes to your old solenoid, and verify part numbers before finalizing the swap.

• Disconnect battery negative before starting replacement
• Confirm terminal size and mounting hole alignment with original part
• Inspect wiring and grounds for corrosion; replace damaged hardware as needed

Who is this for: The BlueStars 12V Starter Solenoid Relay is intended for boat owners, marine mechanics, and service shops needing a reliable, direct-replacement solenoid for Mercury and Force outboards. It suits users restoring older motors or upgrading worn starter components, and anyone seeking corrosion-resistant materials and a high-temperature coil in a compact housing. If you require a part that matches Mercury 89-817109A1/A2/A3 cross-references or equivalent Sierra/Arco numbers, this BlueStars relay offers an affordable, durable option backed by lifetime protection.