Mercury – Voltage Regulator Kit | Electrical Charging System | Marine-Grade Components | 8M0084173

Overview

Every boater has had that moment — you turn the key, the engine fires, and you instantly know the electrical system is happy. There’s a kind of quiet confidence in seeing your gauges settle where they should and knowing your battery is charging the way it’s supposed to. The Mercury 8M0084173 Voltage Regulator helps deliver that peace of mind. It keeps your outboard’s electrical system stable whether you’re trolling slowly through a quiet cove or pushing across open water with a full day’s gear on board. It’s one of those parts you don’t think about until it’s missing… and then you appreciate it every time the engine runs smooth and strong.

Key Features

• Voltage regulator kit engineered for consistent charging output.
• Includes regulator, 30-amp mini fuse block, wire leads, connectors, and mounting hardware.
• Designed for use on select Mercury and Mariner two-stroke outboards.
• Marine-grade components built to handle vibration, moisture, and heat.
• Helps maintain battery health and stable voltage throughout the electrical system.
• Built to Mercury Marine OEM specifications for long-term reliability.

Engine & Boat Compatibility

• For various Mercury and Mariner two-stroke outboards
• Common on 25–115 horsepower platforms depending on model and year
• Ideal for fishing boats, aluminum tiller rigs, pontoons, runabouts, and lightweight skiffs
• Compatible with charging systems requiring a dedicated regulator and fuse block assembly

Performance & Practical Benefits

A dependable voltage regulator makes your entire day on the water feel smoother. With the Mercury 8M0084173 installed, you’ll notice your electrical system staying steady even when running electronics, pumps, lights, or trolling gear. The charging output remains consistent, giving your battery the healthy, “secure” feeling it needs to handle long days and frequent starts.

The regulator itself mounts cleanly and gives a tight, confident fit. The included fuse block protects the system against overloads, while the pre-terminated wire leads make installation feel straightforward rather than frustrating. Once in place, the system delivers a balanced flow of power that keeps your outboard from surging or dipping when electrical demand changes.

Durability matters, especially in marine environments. This regulator is built to withstand the constant vibration of a two-stroke, the salt spray that inevitably finds its way into the engine compartment, and the heat that builds during long running hours. It’s designed not just to work, but to keep working season after season.

Why Buy OEM

Electrical parts are not something to gamble on. An aftermarket regulator might look similar, but even slight differences in voltage output or internal components can lead to battery issues, weak starts, or inconsistent performance. With this genuine Mercury Marine part, you’re getting components engineered specifically for your outboard — with the correct output, proper protection, and the long-term reliability Mercury is known for. Choosing OEM means fewer surprises, smoother operation, and a charging system you can count on every time you push off from the dock.

FAQ

Q1: Which engines does the 8M0084173 Voltage Regulator fit?

It’s designed for use on various Mercury and Mariner two-stroke outboards. Consult your engine’s serial number and manual for exact compatibility.

Q2: What makes this regulator better than aftermarket versions?

OEM regulators provide precise voltage control, higher durability, and proper fitment — reducing the risk of electrical issues.

Q3: How do I confirm this is the right part?

Check your owner’s manual or serial-number-specific parts list for the exact Mercury Marine part number required.

Q4: Can it be used in both saltwater and freshwater?

Yes. It’s built with marine-grade materials designed to resist corrosion and vibration in all environments.

Q5: Is installation straightforward?

Most boat owners with basic electrical knowledge can install it, thanks to the included fuse block, wire leads, and mounting hardware.