Mercury – Warning Horn Kit | Piezo Alarm Upgrade | 816492A9

Overview

A warning horn is one of the simplest but most important pieces of onboard protection. The Mercury 816492A9 Warning Horn Kit gives your engine a clear, reliable audible alert when something needs attention—oil, temperature, or other key engine parameters. This kit uses the newer piezo-style horn, designed to work with later-model remote controls and harnesses, and brings modern reliability to engines that need a proper SmartCraft-compatible audible warning.

Key Features

• Updated Piezo Horn – Modern high-clarity horn used on 1986-and-newer remote controls and harnesses.
• Engine Alert Output – Provides audible alarms for engine protection systems.
• V-6 Compatibility – Fits 2000 and newer Mercury/Mariner V-6 outboards.
• High-Performance Coverage – Also fits MY2002+ 525–1200 HP Mercury Racing sterndrives.
• Plug-In OEM Fit – Designed to match Mercury harness connectors for quick installation.
• Durable Alarm Unit – Resistant to moisture, vibration, and heat in tight helm spaces.

Compatibility

• 2000+ Mercury V-6 outboards
• 2000+ Mariner V-6 outboards
• 2002+ Mercury Racing 525–1200 HP sterndrives
• 1986+ Mercury/Mariner remote controls and wiring harnesses

Performance & Practical Benefits

This horn gives you loud, unmistakable alerts when the engine detects a condition that needs attention. The piezo design provides a sharper, more reliable tone than older buzzer-style units, making it easier to hear through wind, engine noise, or open cockpits. Installation is straightforward, and once connected, the horn becomes a dependable part of your engine’s warning system, giving you peace of mind every time you start the motor.

Why Buy OEM

Critical alarms should never rely on off-brand components. Mercury’s OEM horn is built to the correct decibel output, wiring spec, and compatibility requirements for later-model controls and harnesses. It ensures warnings sound exactly when they should and avoids false alerts or silent failures common with non-OEM replacements.

FAQ

Q1: When should I replace a warning horn?
If your engine alarms aren’t sounding, sound weak, or behave inconsistently, the horn is often the culprit.

Q2: Does this horn work on older controls?
It’s intended for 1986-and-newer remote controls and harnesses.

Q3: Will it work on all V-6 outboards?
It fits 2000 and newer Mercury/Mariner V-6 models.

Q4: Can this be used on Mercury Racing sterndrives?
Yes—MY2002+ 525, 600, 700, 850, 1075, and 1200 HP models are supported.

Q5: Is installation difficult?
No. It typically plugs directly into the control or harness connection point.

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.