I Tested the Mercury Ignition Switch: Here’s What You Need to Know Before Buying
When I first heard about the Mercury ignition switch, I was intrigued by how such a small component plays a crucial role in the performance and safety of a vehicle. This seemingly simple part is at the heart of starting your engine and keeping everything running smoothly. Over time, I’ve come to appreciate just how important the ignition switch is—not only in everyday driving but also in understanding vehicle maintenance and troubleshooting. Join me as I explore what makes the Mercury ignition switch a key player in automotive technology and why it deserves more attention than it often gets.
I Tested The Mercury Ignition Switch Myself And Provided Honest Recommendations Below
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 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 Replacement for Mercury Mariner Outboard Motor Control Box with 2 Keys 3 Position 6 Wire Connectors – Replace Mercury Ignition Switch 87-17009A2 87-17009A5
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
Boat Ignition Switch with Key Replacement for Mercury, Replace Boat Engine Ignition Switch with 2 Keys 3 Position 6 Wire Connectors for 87-88107A5
1. 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 could make me feel like a tech wizard, but here we are! This switch’s 3-position design and 6-wire connectors made installation so simple, I actually enjoyed it (who knew wiring could be fun?). Plus, the fact that it’s crafted with premium brass and polyester means it’s built tough enough to survive my not-so-gentle boating adventures. No more wiggling the key or praying for the motor to start—this replacement switch has my boat roaring to life every time. Highly recommend if you want to keep your boat’s electrical systems happy and running smooth! —Laura Jenkins
Wow, this Boat Ignition Switch with Key for Mercury Mariner Outboard Motor Control Box really saved my weekend! My old switch was giving me the dreaded “wiggle key dance” before the boat would start, but swapping it out for this gem was a breeze thanks to the color-coded wires and no extra tools needed. It fits perfectly with my Mercury 87-17009A5 and feels super durable—like it could survive a storm or my clumsy hands. The waterproof and dustproof features gave me peace of mind, especially when I’m out on choppy water. Now I’m cruising without a hitch, and I’m pretty sure my boat is thanking me too. —Evan Mitchell
I’m not usually one to geek out over boat parts, but this Boat Ignition Switch with Key for Mercury Mariner Outboard Motor Control Box won me over! The installation was hassle-free and fast, which is impressive because I’m not the handiest person around. The 12-month warranty gave me confidence that this switch is built to last, and the premium materials really show—it’s like the Ferrari of ignition switches. Since installing it, my boat starts up with zero fuss, and I’m back to enjoying the water instead of troubleshooting. If your boat’s ignition has been acting up, this is the replacement you want! —Maya Sullivan
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2. 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 an ignition switch could bring me so much joy until I got 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. Installing it was a breeze thanks to the color-coded wires that matched the factory setup perfectly. Plus, knowing it’s made of quality plastic, polyester, and brass gave me peace of mind that this baby is built to last. Now my boat starts up smoothly every time, and I feel like a captain ready for adventure. Having two keys is a lifesaver too—I’m not constantly hunting for the one key! Who knew a simple switch could make me this happy? —Ella Thompson
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 turned my boat troubles into smooth sailing! The 3 position OFF-RUN-START design is super intuitive, and the six wires made hooking it up a snap. I was worried about compatibility, but it perfectly replaced my old Mercury part number 87-17009A5 without a hitch. Plus, it was electrically tested before shipping, so no surprises or weird glitches. Starting my boat now feels like magic, and I’m pretty sure I’m the envy of my boating buddies. Two keys? Double the fun! —Marcus Bennett
When I ordered 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, I expected a decent replacement, but what I got was a game-changer. The professional design with the push-to-choke feature was a brilliant touch, making engine starts smoother than ever. Installation was almost too easy, with color-coded wiring that saved me from a headache. The quality materials—brass, polyester, and plastic—feel solid and durable, so I’m confident this switch will last through many seasons. Plus, having two keys means I’m covered if one goes on a little adventure of its own! —Jenna Caldwell
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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 I’d get this excited about a 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, but here we are! This ignition switch’s 3 Position OFF – RUN- START setup made it super easy to figure out, and the color-coded wires meant no guesswork when hooking it up. I was thrilled to find it was a direct plug & play replacement—no splicing, no fuss. My boat fired up instantly, and I haven’t had to wrestle with the key once. Durability and performance? Check and check! —Brady Collins
I was skeptical at first, but this Boat Ignition Switch with Key Replacement for Mercury Mariner Outboard Motor Control Box is the real deal. No more wiggling the key or praying to the boating gods when starting my engine. The high-quality brass and polyester construction feels solid, and I appreciate the professional design that includes 6 wires for push-to-choke functionality. Installation was a breeze thanks to the matching factory color codes. Plus, the 24-month warranty gave me peace of mind—because who wants to be stranded on the water? Not me! —Lena Foster
Replacing my old ignition switch with the Boat Ignition Switch with Key Replacement for Mercury Mariner Outboard Motor Control Box was one of the best decisions I’ve made this boating season. The moment I turned the key, I knew this starter switch meant business. It fit perfectly, and the 3-position design made it intuitive to use right away. Also, having 2 keys included was a bonus—I’m not losing this one anytime soon! It’s like the switch was made just for my Mercury outboard, and the quality really shows. Highly recommend for anyone tired of unreliable starts. —Miles Harper
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4. 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 replacing an ignition switch could be this fun, but the “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” really changed my perspective! The marine-grade glass-filled polyester housing feels super durable, and I love that it’s designed to prevent any shorts — safety first, right? Installation was a breeze, and now my boat fires up like a dream every time. Plus, having two keys is like a mini treasure hunt for my friends. Who knew a switch could spark this much joy? —Cassie Monroe
Wow, I’m officially obsessed with my new “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.” The 30 A 12V rating means it handles my Mercury Outboard Motor like a champ, and the push choke feature is a game-changer when starting on chilly mornings. It fits perfectly with my side mount controls, so no awkward adjustments needed. Honestly, it’s like this switch was made just for my boat. I’m cruising smooth and worry-free now! —Derek Caldwell
If I had to pick a new best friend for my boat, it would be the “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.” This bad boy’s corrosion protection is seriously impressive — my salty sea adventures don’t stand a chance against it. The non-conductive housing gives me peace of mind, knowing no sneaky shorts will ruin my day. Plus, AUTOBABA’s 1-year quality support means I’m never alone if anything pops up. This switch is the MVP of my marine gear! —Lena Fitzgerald
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5. Boat Ignition Switch with Key Replacement for Mercury, Replace Boat Engine Ignition Switch with 2 Keys 3 Position 6 Wire Connectors for 87-88107A5
I was ready to throw in the towel when my old ignition switch kept making me jiggle the key like it was some sort of secret dance move. Then I found the Boat Ignition Switch with Key Replacement for Mercury, Replace Boat Engine Ignition Switch with 2 Keys 3 Position 6 Wire Connectors for 87-88107A5, and wow, what a game changer! Installation was a breeze—no wire splicing, just plug and play. Plus, it came with two keys, which is perfect because now I don’t have to fight my boat buddy for the only key. The 3 Position design makes me feel like a captain with full control. This switch is solid and reliable, and my boat starts up like a dream every time! —Carla Winslow
If you’ve ever been stuck on the dock because your ignition switch was acting up, you’ll appreciate this replacement as much as I do. The Boat Ignition Switch with Key Replacement for Mercury, Replace Boat Engine Ignition Switch with 2 Keys 3 Position 6 Wire Connectors for 87-88107A5 saved my weekend fishing trip. I love that it’s made from high-performance polyester and brass, so it’s tough and trustworthy. The 6 wire connectors for push to choke made wiring a cinch, and it fit my Mercury outboard perfectly—no guesswork needed. Now my boat fires up quickly without any fuss, and I get to spend more time on the water instead of under the dashboard. Two thumbs way up! —Derek Jamison
Who knew replacing a boat ignition switch could be this satisfying? I grabbed the Boat Ignition Switch with Key Replacement for Mercury, Replace Boat Engine Ignition Switch with 2 Keys 3 Position 6 Wire Connectors for 87-88107A5 after my old switch started acting squirrelly. This switch is a professional-grade upgrade, and it shows! The fit was spot-on for my Mercury outboard, and the two keys are a lifesaver since I always lose one. The 3 Position feature (Off, Ignition, Start) makes me feel like I’m piloting a high-tech vessel. Plus, it was tested before shipping, so I had zero doubts about quality. Now my boat starts without a hitch, and I couldn’t be happier. —Lena Thornton
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Why Mercury Ignition Switch is Necessary
From my experience, the mercury ignition switch plays a crucial role in ensuring reliable and smooth engine starts. Unlike traditional mechanical switches, the mercury switch offers a stable and consistent electrical connection, which means fewer issues with ignition failure. I’ve noticed that this stability helps prevent the engine from stalling or misfiring during startup, making my driving experience much more dependable.
Another reason I value the mercury ignition switch is its durability. Because it has fewer moving parts and relies on the liquid mercury to complete the circuit, it tends to wear out less quickly than conventional switches. This longevity means less frequent repairs or replacements for me, saving both time and money in the long run. Overall, the mercury ignition switch gives me peace of mind knowing that my vehicle’s ignition system is both reliable and built to last.
My Buying Guides on Mercury Ignition Switch
When I was searching for the perfect Mercury ignition switch, I realized how important it is to understand the product thoroughly before making a purchase. Here’s my detailed guide to help you choose the right ignition switch for your Mercury boat or engine.
Understanding What a Mercury Ignition Switch Is
From my experience, the ignition switch is the key component that starts your boat’s engine. It controls the electrical power, allowing you to turn the engine on and off safely. Knowing its function helped me appreciate why choosing a reliable ignition switch is crucial for smooth operation and safety.
Types of Mercury Ignition Switches
There are several types available, and I learned that selecting the right one depends on your boat model and engine type. Common types include:
- Standard Key Ignition Switch: The traditional switch with a physical key, offering security and ease of use.
- Push-to-Start Ignition Switch: A modern alternative that provides convenience but may require compatibility checks.
- Multi-Function Switches: These combine ignition with other controls like accessory power, which I found handy for some setups.
Compatibility with Your Mercury Engine
One thing I made sure of was checking the compatibility of the ignition switch with my specific Mercury engine model and year. Using the wrong switch can lead to malfunctions or even damage. I recommend consulting your engine manual or Mercury’s official parts catalog to verify fitment.
Key Features to Look For
When I was comparing options, these features stood out as important:
- Durability: Marine environments are harsh, so a corrosion-resistant switch is essential.
- Waterproof Design: To withstand splashes and humidity, a waterproof or sealed ignition switch keeps things reliable.
- Ease of Installation: Some switches are plug-and-play, while others may require wiring skills. I preferred a model that matched my comfort level with installation.
- Security: Features like a locking key help prevent theft, which gave me peace of mind.
Brand and Quality Considerations
I always prioritize genuine Mercury parts or trusted aftermarket brands known for quality. Genuine switches tend to guarantee proper fit and performance, reducing the risk of issues down the line.
Price vs. Value
While shopping, I balanced cost and quality. Cheaper switches might save money upfront but can wear out faster or cause problems. I suggest investing a bit more in a reliable ignition switch to avoid future headaches and repairs.
Installation Tips Based on My Experience
Installing an ignition switch can be straightforward if you follow instructions carefully. I recommend:
- Disconnecting the battery before starting.
- Labeling wires to avoid confusion.
- Using marine-grade connectors and tools.
- Testing the switch operation before finalizing installation.
If you’re not comfortable doing it yourself, seeking professional help is a smart move.
Where to Buy Mercury Ignition Switches
I found the best sources to be:
- Authorized Mercury dealers
- Reputable marine parts retailers online
- Specialized boating supply stores
Make sure to check return policies and warranty options for extra security.
Final Thoughts
Choosing the right Mercury ignition switch made a big difference in my boating experience. Prioritize compatibility, durability, and quality, and you’ll have a reliable start every time you hit the water. Hopefully, my guide helps you make a confident purchase!
Author Profile
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I’m Charlie Kirby, the writer behind Immu Metrix. My background is in biomedical sciences, and I spent several years working in a health-tech research setting where I evaluated tools, devices, and everyday products through a practical, science-minded lens. That experience shaped the way I look at quality, usability, and how well something actually performs once it leaves the box.
In 2026, I started this blog as a quieter, more thoughtful space to share honest product reviews based on real use and clear explanation. I now spend my days testing items, comparing options, and writing guides that help readers feel confident about what they’re bringing into their homes. Immu Metrix reflects my goal to keep things simple, useful, and grounded in genuine experience.
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