Mercury – MP Alert Y-Harness | Expansion Splitter for Additional Lights | 84-8M0053250

Overview

If you're expanding your MP Alert setup and want to add a third or fourth light, this harness makes the job painless. The Mercury 84-8M0053250 MP Alert Y-Harness creates a clean, plug-and-play split in the MP Alert wiring so you can connect extra oval smart lights without modifying the original harness. It’s the simplest way to boost light coverage around the transom for better swimmer visibility and overall safety.

Key Features

• Plug-In Y-Splitter – Creates an easy branch in the MP Alert wiring to add more lights.
• Supports Multi-Light Installations – Ideal for boats needing three or four MP Alert lights.
• SmartCraft Ready – Works with all SmartCraft-compatible engines running an MP Alert system.
• Clean Wiring Solution – Avoids splicing or custom wiring when expanding the system.
• OEM Connectors – Mercury factory plugs ensure secure, weather-resistant connections.
• Flexible Layout Options – Allows lights to be positioned exactly where visibility is needed most.

Compatibility

• All SmartCraft-compatible engines
• MP Alert base kits and expansion kits
• Oval MP Alert lights and cowl-mounted MP Alert options

Performance & Practical Benefits

This harness makes expanding your MP Alert system quick and clean. Whether you’re adding lights to cover the far sides of a wide swim platform or increasing visibility around a deep-V hull, the Y-harness plugs directly into the system and keeps the wiring neat. Once connected, the added lights activate automatically whenever the prop is moving—no settings, no switches, no additional programming.

Why Buy OEM

The MP Alert system relies on correct pin alignment, waterproof connectors, and stable signal flow. Mercury’s OEM Y-Harness guarantees everything fits securely and communicates cleanly. Aftermarket splitters often introduce weak connections or intermittent activation, but the factory harness provides long-term reliability and proper SmartCraft behavior.

FAQ

Q1: How many lights can I add with this harness?
This Y-harness supports adding a third or fourth MP Alert light.

Q2: Does it work with both SmartCraft and non-SmartCraft MP Alert systems?
It is designed specifically for SmartCraft-compatible MP Alert setups.

Q3: Does installation require rewiring?
No. It’s a direct plug-in connector—no cutting or splicing.

Q4: Can it be used with cowl-mounted MP Alert lights?
Yes. It works with any oval MP Alert light, including cowl-mounted options.

Q5: Is it waterproof?
Yes. OEM connectors and cable jackets are built for harsh marine environments.