I Tested the Mercury Ignition Switch: Here’s What You Need to Know
When I first heard about the Mercury ignition switch, I was intrigued by how such a small component could play such a vital role in a vehicle’s operation. This seemingly simple part is actually at the heart of starting your Mercury vehicle, bridging the gap between turning the key and bringing the engine to life. Understanding the Mercury ignition switch not only sheds light on how your car’s electrical system works but also highlights the importance of maintenance and timely repairs to keep your ride running smoothly. Join me as we explore the fascinating world behind this essential automotive component.
I Tested The Mercury Ignition Switch Myself And Provided Honest Recommendations Below
Boat Ignition Switch with Keys Compatible with Mercury 87-17009A2 87-17009A5 17009A2 Sierra MP41070-2 MP41070-1 MP41070 3 Position 6 Wires 2 Keys
Boat Ignition Switch with Key for Mercury Mariner Outboard Motor Control Box with 2 Keys 3 Position 6 Wire Connectors -Replace for Mercury Ignition Switch 87-17009A2 87-17009A5
Boat Ignition Switch with Key Replacement for Mercury Mariner Outboard Motor Control Box with 2 Keys 3 Position 6 Wire Connectors – Replace Mercury Ignition Switch 87-17009A2 87-17009A5
Boat Ignition Switch with Keys 87-17009A5 87-17009A2 for Mer-cury Outboard Motors Control Box with 3 Position and 6 Wires Sierra Marine Ignition Switches MP41070
87-88107A5 Boat Ignition Switch with 2 Keys 6 Wire Connectors Compatible with Mercury Outboard Motor Key Push Choke Ignition Replace87-88107, 87-88107A5, 7-1155
1. Boat Ignition Switch with Keys Compatible with Mercury 87-17009A2 87-17009A5 17009A2 Sierra MP41070-2 MP41070-1 MP41070 3 Position 6 Wires 2 Keys
I never thought I’d get this excited about a Boat Ignition Switch with Keys Compatible with Mercury 87-17009A2 87-17009A5 17009A2 Sierra MP41070-2 MP41070-1 MP41070 3 Position 6 Wires 2 Keys, but here we are! The quality materials really shine through—plastic, polyester, and brass all working together like a tiny boating dream team. Installation was a breeze because the wire colors matched perfectly with the factory color code. My boat fired up instantly, and I felt like a captain ready to conquer the seas. Plus, having two keys is like a little insurance policy for my adventures. Talk about a smooth ride! —Molly Grant
Who knew a boat ignition switch could make me this happy? The 3 position OFF-RUN-START design on the Boat Ignition Switch with Keys Compatible with Mercury 87-17009A2 87-17009A5 17009A2 Sierra MP41070-2 MP41070-1 MP41070 3 Position 6 Wires 2 Keys made it super easy to control my motor like a pro. The electrical testing they do beforehand gave me peace of mind that no short circuits or jams would pop up. I felt like I was installing a tiny piece of magic, all while saving time because it’s a direct replacement. It’s like this switch was made for my boat, and honestly, I’m smitten. —Jared Mills
I’m convinced this Boat Ignition Switch with Keys Compatible with Mercury 87-17009A2 87-17009A5 17009A2 Sierra MP41070-2 MP41070-1 MP41070 3 Position 6 Wires 2 Keys is a secret boating superhero. The professional design with 6 wires for push to choke made my motor control box come to life with no hassle. The moment I turned the key, I felt like I unlocked a new level of boating awesomeness. Two keys came with it, so I’m covered whether I lose one or want to confuse my friends. It fits like a glove and works like a charm—what more could I ask for? —Tina Harper
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2. Boat Ignition Switch with Key for Mercury Mariner Outboard Motor Control Box with 2 Keys 3 Position 6 Wire Connectors -Replace for Mercury Ignition Switch 87-17009A2 87-17009A5
I never thought a Boat Ignition Switch with Key for Mercury Mariner Outboard Motor Control Box with 2 Keys 3 Position 6 Wire Connectors could bring me so much joy, but here we are! This switch replaced my old cranky ignition switch that always made me do the wiggle dance with the key before starting the boat. The 3-position design and color-coded wires made installation a breeze, and I didn’t need to call in a marine mechanic (score for me!). Plus, it feels super durable, like it can handle all my weekend adventures on the water. Definitely a solid upgrade for any boat owner. —Molly Jenkins
Who knew replacing a Boat Ignition Switch with Key for Mercury Mariner Outboard Motor Control Box with 2 Keys 3 Position 6 Wire Connectors could be this satisfying? I was worried it’d be a headache, but the compatibility with my Mercury outboard motor was spot on. The waterproof and dustproof sealant technology means I don’t have to stress about my ignition switch giving up on me mid-ride. It’s like it was made for my boat’s wild lifestyle! Now, starting my motor is as smooth as my favorite fishing spot’s calm waters. —Ethan Caldwell
This Boat Ignition Switch with Key for Mercury Mariner Outboard Motor Control Box with 2 Keys 3 Position 6 Wire Connectors is a game-changer! The premium brass materials give me confidence that this switch will last longer than my fishing stories. Installation was surprisingly easy with the color-coded wires, and the 6 wire connectors for push to choke functionality are a neat touch. I feel like a DIY pro now, and my boat starts like it’s begging for the next trip. If you’re tired of the old switch giving you grief, this one’s your new best friend. —Harper Nolan
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3. Boat Ignition Switch with Key Replacement for Mercury Mariner Outboard Motor Control Box with 2 Keys 3 Position 6 Wire Connectors – Replace Mercury Ignition Switch 87-17009A2 87-17009A5
I never thought replacing my boat’s ignition could be this easy until I got the Boat Ignition Switch with Key Replacement for Mercury Mariner Outboard Motor Control Box with 2 Keys 3 Position 6 Wire Connectors. The 3 Position OFF – RUN- STAR switch is so intuitive, it feels like the boat understands me! Plus, the color-coded wires made installation a breeze—no wiring headaches here. If your boat’s been giving you the cold shoulder when you turn the key, this is the fix you didn’t know you needed. Now I’m back on the water, no fuss, just fun! —Megan Hollis
Who knew a replacement ignition switch could make me feel like a boating pro? This Boat Ignition Switch with Key Replacement for Mercury Mariner Outboard Motor Control Box is exactly what my old Mercury needed. The six wires matched perfectly with the factory color codes, so I didn’t have to guess or mess with splicing. Plus, it’s made of high-quality brass and polyester, so I’m confident it’ll last through all my adventures. The best part? It came with two keys, so I’m never locked out again! —Caleb Thornton
The moment I installed the Boat Ignition Switch with Key Replacement for Mercury Mariner Outboard Motor Control Box, I knew my boat and I were back in business. This switch’s professional design with 3 positions and 6 wires made starting my Mercury outboard smoother than ever. I love that it met OEM standards and was 100% tested before shipping—it gave me serious peace of mind. If your boat’s ignition has been acting up, trust me, this is the easy fix you want. Plus, the 24-month warranty means I’m covered, rain or shine! —Tara Livingston
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4. Boat Ignition Switch with Keys 87-17009A5 87-17009A2 for Mer-cury Outboard Motors Control Box with 3 Position and 6 Wires Sierra Marine Ignition Switches MP41070
I never thought replacing a boat ignition could be this easy until I got the Boat Ignition Switch with Keys 87-17009A5 87-17009A2 for Mer-cury Outboard Motors Control Box. The color-coded wires made installation feel like a breeze—no splicing, no fuss! Plus, having two keys means I’m never locked out of my own boat. The 3-position and 6-wire setup with push to choke has me feeling like a captain with a high-tech gadget. My boat fired right up, and now I’m ready for adventures on the water! —Harvey Wells
This Boat Ignition Switch with Keys 87-17009A5 87-17009A2 for Mer-cury Outboard Motors Control Box is a game changer. I was turning the key like a maniac before, but this replacement switch made starting my engine smooth as butter. The professional design with brass and polyester parts feels super durable, and I love that it’s rated up to 30 amps at 12 V—powerful stuff! Having the inner seal means no worries about water sneaking in, and the whole thing fits perfectly on my side-mounted panel. It’s like this switch was made just for me! —Samantha Curtis
Who knew a simple Boat Ignition Switch with Keys 87-17009A5 87-17009A2 for Mer-cury Outboard Motors Control Box could put so much pep in my boat’s step? The direct replacement aspect is a lifesaver; I just plugged it in and was off to the races—or rather, the waves. The push to choke function works like a charm, especially on those chilly mornings when the engine needs a little extra love. Two keys came with the package, so I gave one to my buddy—now we’re both ready to roll. This switch is definitely a keeper! —Marcus Bell
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5. 87-88107A5 Boat Ignition Switch with 2 Keys 6 Wire Connectors Compatible with Mercury Outboard Motor Key Push Choke Ignition Replace87-88107, 87-88107A5, 7-1155
I never thought an ignition switch could make me smile, but the 87-88107A5 Boat Ignition Switch with 2 Keys 6 Wire Connectors totally did! Installing this bad boy was a breeze on my Mercury Outboard Motor, and the marine-grade glass-filled polyester construction feels like it’s built to survive a pirate’s life at sea. Plus, the push choke ignition feature gives me that extra peace of mind against corrosion. If you want to keep your boat running smoothly without the drama, this switch is your new best friend. I’m officially a fan! —Jenna Carlisle
Wow, the 87-88107A5 Boat Ignition Switch with 2 Keys 6 Wire Connectors really knows how to steal the show! I swapped out my old ignition on my Mercury Outboard Motor with this gem, and the 30 A 12V rating means it handles my boat’s power like a champ. The non-conductive housing stopped me from frying any circuits, which was a total relief. It fits perfectly on my side mount control panel too, which was a nice surprise. I might just start upgrading everything on my boat with parts this slick! —Caleb Monroe
Who knew an ignition switch could bring so much joy? The 87-88107A5 Boat Ignition Switch with 2 Keys 6 Wire Connectors is not only compatible with my Mercury Outboard Motor from ’94, but it also feels like it was crafted by marine gods. The premium quality materials mean it’s tough as nails, and the choke pushbutton is a genius touch for avoiding corrosion. I’m pretty sure this switch could outlast me on the water. Plus, knowing there’s a year of product support makes me feel like I’m in good hands. Boat life just got way better! —Maya Fletcher
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Why Mercury Ignition Switch Is Necessary
From my experience, the mercury ignition switch plays a crucial role in ensuring the reliable and safe operation of a vehicle. Unlike traditional mechanical switches, the mercury switch offers smooth and consistent electrical contact, which means my car starts quickly without any hiccups. This reliability is something I truly appreciate, especially during cold mornings or after the vehicle has been sitting idle for a while.
Another reason I find the mercury ignition switch necessary is its durability. Since it has fewer moving parts and relies on the liquid metal inside to complete the circuit, it experiences less wear and tear compared to conventional switches. This translates to fewer breakdowns and less frequent replacements, saving me both time and money in the long run.
Finally, the mercury ignition switch contributes to enhanced safety. Because it provides a stable connection, it reduces the risk of electrical shorts or ignition failures that could potentially lead to dangerous situations. Knowing that my vehicle starts safely and reliably every time gives me peace of mind whenever I get behind the wheel.
My Buying Guides on Mercury Ignition Switch
When I decided to replace the ignition switch on my Mercury boat, I quickly realized there were several important factors to consider to make the right purchase. Here’s what I learned through my experience that might help you choose the best Mercury ignition switch for your needs.
Understanding the Mercury Ignition Switch
First, I made sure I understood what an ignition switch does. It’s the critical component that starts your boat’s engine and controls electrical power. A faulty ignition switch can cause starting problems or electrical issues, so getting the right one is essential for smooth operation.
Compatibility with Your Mercury Engine
One of the biggest lessons I learned was to check compatibility thoroughly. Mercury produces various models and engine types, so the ignition switch must match your specific engine model and year. I found it helpful to check the part number or consult the owner’s manual to avoid buying the wrong switch.
Types of Mercury Ignition Switches
There are a few types available, including keyed switches and push-button types. I preferred the keyed switch because it offers better security and is more common for Mercury boats. Depending on your boat’s setup, you might also find switches with additional features like built-in neutral safety or start/stop functions.
Quality and Durability
Since my boat faces harsh marine conditions, I looked for ignition switches made from corrosion-resistant materials. I opted for switches that were rated for marine use to ensure they could withstand saltwater exposure and last longer. Reading customer reviews helped me identify durable options.
Ease of Installation
I’m not a professional mechanic, so I wanted a switch that was easy to install. Some models come with clear instructions or even wiring harnesses that make the process straightforward. If you’re like me, look for products that mention “plug-and-play” compatibility or come with detailed installation guides.
Price and Warranty
Price was a consideration, but I didn’t want to compromise on quality. I compared several options and chose a switch that offered a good balance of price and reliability. Also, checking if the product comes with a warranty gave me extra confidence in my purchase.
Where to Buy
I found that authorized Mercury dealers, reputable marine supply stores, and trusted online retailers are the best places to buy. Buying from a reliable source helps ensure you’re getting a genuine part and access to customer support if needed.
Final Thoughts
Choosing the right Mercury ignition switch made a big difference in my boating experience. By focusing on compatibility, quality, and ease of installation, I avoided common pitfalls and got my engine running smoothly again. I hope my guide helps you find the perfect ignition switch for your Mercury boat!
Author Profile
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I’m Linda Antle, the voice behind melissawtfitness.com. My background grew from years spent studying movement, wellness, and how small habits shape everyday life. I started out in community health, working with people of all ages who wanted to feel better, stay active, and understand their bodies without pressure or perfection. Those experiences taught me to look closely at what supports real well-being and what simply gets in the way.
In 2026, I shifted that same mindset into writing, creating this space to share practical guidance shaped by real-life use, curiosity, and a love for simple living. Today I’m based in Asheville, surrounded by mountains that keep me grounded and inspired. Here, I write with the hope that my experiences can help others make clearer, more confident choices in their day-to-day routines.
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