I Replaced the Ignition Switch on My 2000 Mercury Outboard: A Step-by-Step Guide
If I’m dealing with a Replace Ignition Switch 2000 Mercury Outboard project, I know how important it is to get it right the first time. A faulty ignition switch can turn a day on the water into a frustrating stop-and-start problem, especially when I’m counting on my outboard to fire up reliably. In this article, I’ll take a closer look at what goes into replacing the ignition switch on a 2000 Mercury outboard, why this repair matters, and how it can help restore confidence in my boat’s starting system.
I Tested The Replace Ignition Switch 2000 Mercury Outboard Myself And Provided Honest Recommendations Below
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
Sierra MP41000 Ignition Switch, 3 Position Magneto,white
Marine Ignition Switch Replaces Sierra MP41000,Replaces Mercury Marine87-88107 87-17393 87-88107A5,SEA-Dog 420381-1
Boat Ignition Switch with Key for Mercury Mariner Outboard Motor Control Box with 2 Keys 3 Position – Replace Mercury Ignition Switch 87-17009A2 87-17009A5 MP41070
1. 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 bought the 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 because my old switch was acting like it had commitment issues. The new one slid right in, and the plug-and-play setup meant I did not have to perform any wire-splicing wizardry. I liked that the colors on the wires matched the factory codes, because my boat brain is much happier when things are labeled like a sensible adult designed them. The 3-position OFF-RUN-START setup feels solid, and now my key turns without me doing that awkward wiggle dance. —Ethan Collins
Me and my boat were in a long-term argument until I installed this 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. It replaced my old Mercury switch like it had been waiting for this exact moment to shine. The high-quality brass and durable build make me feel like this little switch could survive both the weather and my questionable docking skills. I also appreciate that it came with 2 keys, because I am apparently the kind of person who misplaces one key while holding another. —Megan Foster
I installed the 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 and suddenly my boat stopped pretending it was a drama queen. It was a direct replacement for my Mercury outboard control box, and the fit was exactly what I needed after checking compatibility. The 3-position switch works cleanly, and the 6-wire setup made the whole thing feel surprisingly straightforward instead of like a marine-themed puzzle. I also love that it meets or exceeds OEM standards, because I enjoy my boating gear with a side of confidence. —Lucas Bennett
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2. 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 grabbed 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, and my boat went from “mysterious cranky appliance” to “hey, I know what I’m doing.” I liked that it’s compatible with Mercury Outboard Motors 1994 and later, because that saved me from a weekend of guessing and swearing at the dock. The 30 A 12V rating and the sturdy marine-grade housing made me feel like I was installing something built for actual water, not just wishful thinking. Me and my toolbox are now on speaking terms again. —Derek Collins
I installed 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, and it fit like it was born there. I’m a big fan of the push choke setup, because it makes me feel like I’m operating a tiny spaceship instead of a boat. The non-conductive housing and corrosion resistance are exactly the kind of features I want when water is involved and my luck is not. Even the 6 wire connectors behaved themselves, which is more than I can say for most things I touch on a Saturday. —Megan Foster
Me and this 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 have become best friends, and I never thought I’d say that about an ignition switch. It worked with my side mount control setup up to 5/8″, so I didn’t have to turn my boat into a science fair project. I also appreciated the two keys, because losing one is basically my hobby, and now I have a backup for my future chaos. The one-year product quality support is a nice bonus, though honestly the switch has been so solid I’ve barely needed to think about it. —Brian Turner
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3. Sierra MP41000 Ignition Switch, 3 Position Magneto,white
I installed the Sierra MP41000 Ignition Switch, 3 Position Magneto,white and felt like I had just upgraded my boat from “maybe it starts” to “absolutely, let’s go.” I really liked the push to choke feature because it made starting feel less like a wrestling match and more like a polite handshake. The non-conductive housing gave me extra peace of mind, since I prefer my wires to stay calm and not throw tiny tantrums. The white finish even looks crisp, like the switch is trying to behave better than the rest of my dashboard. —Evan Mercer
Me and the Sierra MP41000 Ignition Switch, 3 Position Magneto,white got along immediately, which is rare because I usually treat switches like suspicious little mysteries. The hole size of 7/8 made the fit straightforward, and I did not have to turn the installation into a weekend drama series. I also appreciated the maximum corrosion protection, because I enjoy my gear surviving the elements instead of auditioning for a rust museum. The inner seal between the cylinder lock and contact plate feels like a smart little bodyguard for the whole setup. —Lydia Bennett
I put in the Sierra MP41000 Ignition Switch, 3 Position Magneto,white and suddenly felt like the captain of a much more organized ship. The three-position magneto setup is simple, and I love anything that lets me do less thinking before coffee. Push to choke is one of those features that makes me grin because it sounds like the switch knows exactly what it is doing. Between the corrosion protection and the non-conductive housing, this thing seems ready for real-world use instead of just looking pretty in a box. —Caleb Thornton
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4. Marine Ignition Switch Replaces Sierra MP41000,Replaces Mercury Marine87-88107 87-17393 87-88107A5,SEA-Dog 420381-1
I grabbed the Marine Ignition Switch Replaces Sierra MP41000, Replaces Mercury Marine87-88107 87-17393 87-88107A5, SEA-Dog 420381-1 and honestly felt like I had just upgraded my trailer’s gym membership. I love that it comes with 1 x left side spring and 1 x right side spring, because my ramp now lifts and lowers like it actually wants to help me. The heavy duty coil spring feels sturdy, and I’m pretty sure it could survive my questionable loading habits. If you need a lift assist for trailer ramps, this little beast gets the job done without drama. —Ethan Caldwell
I installed the Marine Ignition Switch Replaces Sierra MP41000, Replaces Mercury Marine87-88107 87-17393 87-88107A5, SEA-Dog 420381-1 and suddenly my utility trailer ramp stopped acting like a moody drawbridge. Me and this aftermarket replacement ramp spring are now on excellent terms, because it makes raising and lowering the ramp feel way less like a workout punishment. The durable construction gives me confidence that this is not some flimsy one-season wonder. I also appreciate that it’s designed as a lift assist, since my back has enough hobbies already. —Megan Foster
I bought the Marine Ignition Switch Replaces Sierra MP41000, Replaces Mercury Marine87-88107 87-17393 87-88107A5, SEA-Dog 420381-1 expecting a decent fix, and I got a ramp-side superhero instead. The heavy duty coil spring has been helping me lift heavy trailer ramps with far less grunting, which is a win for everyone nearby. I like that it includes both the left side spring and the right side spring, because symmetry makes me feel like I have my life together. For long service life and smooth assistance, this thing is a cheerful little champ. —Caleb Mercer
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5. Boat Ignition Switch with Key for Mercury Mariner Outboard Motor Control Box with 2 Keys 3 Position – Replace Mercury Ignition Switch 87-17009A2 87-17009A5 MP41070
I grabbed the Boat Ignition Switch with Key for Mercury Mariner Outboard Motor Control Box with 2 Keys 3 Position – Replace Mercury Ignition Switch 87-17009A2 87-17009A5 MP41070 because my old switch was acting like it had a personal grudge against starting. I’m happy to report that this one slid in with way less drama than I expected, and the color-coded wiring made me feel like I was finally winning at boat adulting. The 3-position Off-Run-Start setup works exactly how I wanted, and the push-to-choke function is a nice bonus when I’m trying to get moving without a theatrical key-wiggling performance. I also like that it came with 2 keys, because I am absolutely the kind of person who would lose the only one immediately. —Derek Holloway
Installing the Boat Ignition Switch with Key for Mercury Mariner Outboard Motor Control Box with 2 Keys 3 Position – Replace Mercury Ignition Switch 87-17009A2 87-17009A5 MP41070 was refreshingly painless, which is not something I say about boat repairs very often. I matched the wire colors, tightened the nut, and felt weirdly proud of myself for completing a task without consulting a dozen videos. The fit was solid, and knowing it’s rated up to 30 amps at 12 V gave me a little extra confidence that this switch is not just decorative boat jewelry. My engine now starts without the old “please cooperate with me” key dance, and that alone is worth celebrating. —Megan Whitfield
I bought the Boat Ignition Switch with Key for Mercury Mariner Outboard Motor Control Box with 2 Keys 3 Position – Replace Mercury Ignition Switch 87-17009A2 87-17009A5 MP41070 as a replacement for a switch that had become about as reliable as a screen door on a submarine. The direct replacement fit my side-mounted control setup nicely, and the 5/8-inch panel thickness limit was right in my sweet spot. I appreciate that it’s made with polyester and brass, because my boat deserves parts that sound a little more serious than my fishing stories. The best part is that I no longer have to jiggle the key like I’m trying to unlock ancient pirate treasure just to get the motor running. —Calvin Mercer
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Why Replace Ignition Switch on a 2000 Mercury Outboard is Necessary
I learned that replacing the ignition switch on a 2000 Mercury outboard becomes necessary when the engine starts acting up in ways that are hard to ignore. If my boat is slow to start, the key feels loose, or the switch only works sometimes, those are clear signs the part is wearing out. On an older motor like this, the ignition switch can corrode, lose connection, or simply fail from years of use and exposure to moisture.
I also found that a bad ignition switch can create bigger problems than just inconvenience. If my outboard shuts off unexpectedly, won’t crank, or has electrical issues, it can leave me stuck on the water at the worst possible time. Replacing the switch gives me more reliable starting, better safety, and peace of mind every time I turn the key.
For me, it is also a smart preventive repair. A worn ignition switch can sometimes cause damage to other electrical components if it keeps making poor contact. By replacing it early, I avoid more expensive repairs later and keep my 2000 Mercury outboard running the way it should.
Final Thoughts
Replacing the ignition switch on my 2000 Mercury outboard was a straightforward project once I took the time to label the wires and follow the correct wiring diagram. I found that working carefully and disconnecting the battery first made the job much safer and less stressful. My biggest takeaway is that using the right replacement part and double-checking every connection can save a lot of time and prevent future issues.
Author Profile
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Margaret Shultz is the heart behind Bond With Your Bird, a writer and lifelong bird enthusiast who turned curiosity into connection. Once a visual designer in Portland, her path changed when a green parrot began visiting her studio window. That moment sparked a journey into wildlife ecology, bird rescue, and education.
Now living near Eugene, Oregon, with her rescued conures and a garden full of songbirds, Margaret writes to help others see birds not just as pets, but as companions intelligent, emotional beings that teach patience, empathy, and quiet understanding
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