817109A2 Mercury Solenoid Assy | Genuine Used Part

🔧 Product Description

Genuine Mercury Marine Starter Solenoid - Part Numbers: 89-817109A1 / 817109A2

A genuine used Mercury Marine 12-volt starter solenoid for selected Mercury and Mariner outboards.

Earlier listings used 817809A2, which contains transposed digits. The identification plate on the component corresponds with 89-817109A1, which is replaced by Mercury service number 817109A2. The solenoid switches high battery current to the starter motor when the ignition key is turned to the start position.

⚙️ Key Features

• Genuine Mercury Marine starter solenoid
• Original part number 89-817109A1
• Current replacement reference 817109A2
• 12-volt four-terminal isolated-base design
• Verified Sierra, ARCO, Arrowhead and WAI replacements available

🚤 Compatibility

Commonly used on

• Mercury and Mariner two-stroke outboard starting systems
• Mercury four-stroke and EFI applications using the same isolated-base solenoid
• Starter circuits requiring the 817109-series four-terminal relay

Typically suits

• Engine models:
• Mercury 65HP and 65 Jet
• Mercury 75HP
• Mercury 80HP and 80 Jet
• Mercury 90HP
• Mercury 100HP
• Mercury 105HP
• Mercury 110 Jet
• Mercury 115HP
• Mercury 125HP
• Mercury 135HP
• Mercury 150HP V6
• Corresponding Mariner outboards using 817109A1, 817109A2 or 817109A3
• HP Range: Approximately 65HP - 150HP
• Electrical System: 12-volt electric start
• Engine Type: Mercury / Mariner two-stroke, EFI and selected four-stroke outboards
• Year Range: Dependent on engine serial number and starter wiring configuration

🔌 Function

The solenoid uses a low-current signal from the ignition switch to connect battery power directly to the starter motor.

⚠️ Common Signs of Failure

• Starter does not operate when the key is turned
• Solenoid clicks but the starter does not crank
• Intermittent starting
• Burnt or corroded high-current terminals
• Starter remains engaged after the key is released

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 817109A3 later related Mercury starter-solenoid reference
• 817109A2 → Supersedes 817109A1
• 817109A1 original Mercury starter-solenoid reference

OEM / Related Numbers

• 89-817109A1
• 817109A1
• 89-817109A2
• 817109A2
• 89-817109A3
• 817109A3
• 10300-12V component marking

Aftermarket / Verified Equivalents

• Sierra: 18-5834
• ARCO Marine: SW109
• Arrowhead: SMR6010
• WAI: 67-731
• DB Electrical: Replacement Solenoid for 89-817109A2

📦 Condition

• Genuine used Mercury part
• Removed from running engine where applicable
• In good working condition unless otherwise stated