Mercury – Moving Prop Alert Light System (Oval) | SmartCraft Safety Kit | 8M0109507

Overview

A spinning propeller can be hard to see in the water—especially for swimmers, divers, or family members near the transom. The Mercury 8M0109507 Moving Prop Alert Light System adds a bright, unmistakable visual warning that activates automatically whenever the prop is in motion. Designed for SmartCraft-compatible engines, this oval-style kit uses dual LED smart lights and a control module linked directly to the engine computer, giving everyone around the boat a clear signal when it’s unsafe to be near the prop.

Key Features

• Dual Smart Lights – Two oval lights, each built with six bright LEDs for high, day-visible warning.
• SmartCraft-Linked Control Module – Ties directly into the engine computer so the lights activate only when the prop turns.
• 20-Foot Harness Included – Long enough for most transom routings; additional lengths sold separately.
• Automatic Safety Alert – No switches—lights come on anytime the engine is running and the prop is moving.
• Expandable Coverage – Compatible with additional smart lights for even greater visibility around the transom.
• Complete Mounting Hardware – Includes brackets and fasteners for a clean, secure installation.

Compatibility

• All SmartCraft-compatible engines
• Oval MP Alert light shape
• Optional add-on smart lights
• Boats wanting an integrated prop-motion warning system

Performance & Practical Benefits

This system gives your boat a clear, instant way to warn swimmers when the propeller is turning. The smart lights flash brightly—even in full sunlight—making it easy for anyone in the water to understand the danger zone around the stern. Because the module communicates directly with SmartCraft, activation is automatic and perfectly timed with engine behavior. The 20-foot harness provides enough length for clean routing on most setups, and the low-profile oval lights mount neatly without cluttering the transom.

Why Buy OEM

Prop-alert systems need flawless communication with the engine, and Mercury’s OEM module uses SmartCraft logic to deliver precise, reliable activation. Off-brand products often guess based on vibration or RPM pickup, which can lead to false alerts—or worse, missed alerts. The OEM system ensures proper timing, weather-sealed components, and lasting performance in real marine conditions.

FAQ

Q1: When does this system activate?
Automatically—whenever the engine is running and the propeller is in motion.

Q2: Can I add more lights?
Yes. The system supports additional smart lights to improve visibility around the stern.

Q3: Does it work with all engines?
It works with all SmartCraft-compatible engines.

Q4: Do I need to flip a switch?
No. The control module handles activation automatically.

Q5: Is installation difficult?
Most installs are straightforward—mount the lights, connect the module, and route the harness.