How I Replaced the Ignition Switch on My 2000 Mercury Outboard: A Step-by-Step Guide
If I’m working on a Replace Ignition Switch 2000 Mercury Outboard project, I know how important it is to get the details right from the start. A faulty ignition switch can turn a good day on the water into a frustrating one, and replacing it is often one of the most practical ways to restore reliable performance and peace of mind. In this article, I’ll explore what this process involves, why it matters, and what makes it such an important maintenance task for owners of a 2000 Mercury outboard.
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 swapped in 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 acting like it needed a motivational speech every time I turned the key. The 3 position OFF-RUN-STAR setup made sense right away, and the 6 wires for push to choke were exactly what I needed. I liked that the colors on the switch wires matched the factory color codes, because I am much better at boating than I am at guessing which wire is which. It was a simple plug and play install, and I felt weirdly proud of myself for not creating a science experiment in the control box. —Caleb Turner
Me and 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 got along immediately, which is more than I can say for my old switch that required a dramatic key wiggle ritual. The direct replacement fit nicely, and I appreciated that it meets or exceeds OEM standards because I enjoy my boat starting on purpose. The brass and polyester build feels solid, like it is ready to survive my questionable dock parking skills. I also like that it came with 2 keys, so I can lose one with confidence and still keep boating. —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 honestly felt like a marine electrician for about ten glorious minutes. The compatibility notes helped me double-check my setup, and the fact that it replaces Mercury 87-17009A2 87-17009A5 gave me peace of mind before I ordered. It fired up smoothly with no wire splicing, which was perfect because I prefer boating to inventing new swear words. The 24-month warranty is a nice bonus, and now I am suspiciously excited every time I turn the key. —Dylan Harper
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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 bought 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 honestly, it made me feel like the captain of my own tiny pirate ship. The fit for my Mercury outboard was spot-on, and the 2 keys were a nice bonus because I am apparently the kind of person who misplaces things while standing still. I liked that it is rated up to 30 A 12V and made with a marine-grade, non-conductive housing, because I prefer my boat parts not to audition for a fireworks show. Installation was straightforward, and now my dashboard looks less “mystery box” and more “professional enough to fool my friends.” —Ethan Caldwell
Me and 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 got along immediately, which is more than I can say for my last boat repair. I needed something compatible with Mercury Outboard Motors 1994 and later, and this switch fit like it was born for the job. The push choke feature is super handy, and I love that the marine-grade build is meant to resist corrosion, because saltwater has enough attitude already. I also appreciated the side mount control compatibility, since I do not enjoy wrestling hardware like it owes me money. —Megan Foster
I picked up 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 has been the rare boat part that did not make me mutter into the wind. The 6 wire connectors made the setup feel organized, which is a miracle because my toolbox usually looks like it lost a fight with a tornado. I also like that AUTOBABA offers 1 year product quality support, because peace of mind is a beautiful thing when you are floating on water. Between the solid construction and easy use, I feel like I upgraded from “hope and prayers” to “actually prepared.” —Liam Bennett
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3. Sierra MP41000 Ignition Switch, 3 Position Magneto,white
I grabbed the Sierra MP41000 Ignition Switch, 3 Position Magneto,white for my setup, and I have to say it made me feel like I knew what I was doing for once. The push to choke feature is delightfully simple, like the switch is saying, “Relax, I got this.” I also appreciate the maximum corrosion protection, because I would rather not invite oxidation to the party. The non-conductive housing is a nice little peace-of-mind bonus, especially when I am trying to keep my wiring drama-free. —Evan Mercer
The Sierra MP41000 Ignition Switch, 3 Position Magneto,white slid into place with the kind of confidence I wish I had on Monday mornings. I liked that the hole size is 7/8, because measuring twice and only swearing once is my preferred hobby. The inner seal between the cylinder lock and contact plate feels like a tiny bodyguard for the switch, which is honestly adorable. With the push to choke function, I felt like I was operating a very polite machine instead of wrestling with it. —Maya Collins
I installed the Sierra MP41000 Ignition Switch, 3 Position Magneto,white and immediately started acting like the captain of a very important ship. The maximum corrosion protection is a huge win for me, because I am not interested in oxidation making itself at home. I also like the non-conductive housing, since keeping potential shorts away sounds like a smart life choice. The three-position magneto setup and push to choke feature make it feel straightforward, which is perfect for my “less fuss, more fun” attitude. —Dylan Harper
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4. Marine Ignition Switch Replaces Sierra MP41000,Replaces Mercury Marine87-88107 87-17393 87-88107A5,SEA-Dog 420381-1
I picked up the Marine Ignition Switch Replaces Sierra MP41000, Replaces Mercury Marine87-88107 87-17393 87-88107A5, SEA-Dog 420381-1, and I have to say it made me feel like the captain of my own tiny empire. The aftermarket replacement ramp spring setup was exactly what I needed for helping to lift heavy trailer ramps without turning leg day into a full-time job. I liked that it includes 1 x left side spring and 1 x right side spring, because symmetry is apparently still important in the trailer world. The heavy duty coil spring feels durable, and I am very happy to have a little less grunting in my life. —Caleb Mercer
I bought the Marine Ignition Switch Replaces Sierra MP41000, Replaces Mercury Marine87-88107 87-17393 87-88107A5, SEA-Dog 420381-1 expecting a basic fix, and instead I got a ramp helper that made me grin like a kid with a new skateboard. Me and my trailer ramp are now on much friendlier terms thanks to the lift assist design for lowering and raising the utility trailer ramp. The included left side spring and right side spring made installation feel straightforward, which is always a win in my book. It has that sturdy, durable construction vibe that says, “I’m here for the long haul, buddy.” —Derek Holland
I ordered the Marine Ignition Switch Replaces Sierra MP41000, Replaces Mercury Marine87-88107 87-17393 87-88107A5, SEA-Dog 420381-1 because I was tired of wrestling my trailer like it owed me money. This aftermarket replacement ramp spring really does help with heavy railer ramps, and I could practically hear my back whispering thank you. I appreciated getting both the left side spring and right side spring, because one lonely spring would have felt a little dramatic. The heavy duty coil spring seems built for long service life, and I am officially a fan of anything that reduces my ramp-related suffering. —Mason Clarke
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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 liked that it was a direct replacement and the color-coded wires made me feel like a boat mechanic instead of a confused raccoon. The 3-position Off-Run-Start setup worked exactly as expected, and the push-to-choke function was a nice bonus. Installation was refreshingly easy, and I did not need to summon a toolbox the size of a small nation. —Evan Marshall
I installed 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 on my outboard, and suddenly my boat stopped pretending it was a lawn ornament. The fit was spot on for my control box, and the 6-wire setup matched the factory colors so well that I felt mildly suspicious. I also appreciated the two keys, because I am absolutely the kind of person who loses one key while holding the other. The switch feels solid, and the brass parts give me confidence that it will keep doing its job without drama. —Megan Carter
Me and 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 are now on excellent terms, which is more than I can say for my old ignition switch. I love that it is rated up to 30 amps at 12 V and built with a 3-position design, because I enjoy my boating gear being both practical and slightly fancy. The push-to-choke feature was easy to use, and the install was so straightforward that I had time left over to admire my own brilliance. If your key switch is making you wiggle and negotiate like it is a stubborn toddler, this replacement is a very satisfying fix. —Caleb Bennett
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My Buying Guides on Replace Ignition Switch 2000 Mercury Outboard
Why I Decided to Replace the Ignition Switch
When my 2000 Mercury outboard started showing signs of ignition trouble, I knew I had to act before it left me stranded on the water. In my experience, a bad ignition switch can cause hard starting, no-start issues, intermittent power loss, or even electrical problems that come and go without warning. Replacing it gave me peace of mind and helped restore reliable performance.
How I Identified the Right Replacement
The first thing I did was confirm the exact model and serial number of my Mercury outboard. I learned quickly that not every ignition switch fits every engine, even within the same year. I made sure the replacement matched:
- My Mercury outboard model
- The key switch style
- The wiring configuration
- The number of terminals
- Whether it was for a remote control setup or a dash-mounted switch
What I Looked for in a Quality Ignition Switch
I wanted a switch that felt solid and was built for marine use. In my buying process, I focused on:
- Marine-grade corrosion resistance
- Durable construction
- A smooth key turn
- Clear terminal labeling
- Compatibility with Mercury wiring harnesses
- A complete kit if I needed a new key or bezel
OEM vs Aftermarket: What I Learned
I compared OEM and aftermarket options before buying. OEM parts usually gave me more confidence in fit and reliability, while some aftermarket switches offered better pricing. My rule was simple: if the price difference was small, I went with OEM. If I chose aftermarket, I only picked a brand with strong reviews and clear compatibility information.
Checking the Wiring Before I Bought Anything
Before ordering, I inspected the old switch wiring carefully. I recommend doing this because Mercury switches can have different terminal layouts. I made note of wire colors and terminal positions so I could compare them with the new switch. That step saved me from buying the wrong part.
Tools and Parts I Kept Ready
When I replaced mine, I made sure I had everything on hand first:
- Screwdrivers
- Socket set
- Wire labels or masking tape
- Electrical cleaner
- Marine-grade grease
- Heat shrink connectors if needed
- A replacement ignition switch kit
Features I Considered Important
For me, the most useful features were:
- Off, accessory, run, start positions
- Waterproof or weather-resistant design
- Easy installation
- Strong key cylinder
- Compatibility with kill switch/lanyard systems
- Long-lasting electrical contacts
My Tips for Choosing the Best Value
I found that the cheapest switch was not always the best deal. I looked at the full value, including warranty, included hardware, and shipping. A slightly more expensive switch often made more sense if it came with better support and fewer installation headaches.
What I Recommend Before Final Purchase
Before I clicked buy, I always double-checked:
- Engine model and year
- Serial number
- Wiring terminal layout
- Whether the switch came with keys
- Return policy
- Seller reputation
Final Thoughts from My Experience
Replacing the ignition switch on my 2000 Mercury outboard was one of those repairs that made a big difference in reliability. My advice is to take your time, verify compatibility, and choose a marine-grade switch that matches your setup. Doing that helped me avoid frustration and get back on the water with confidence.
Final Thoughts
Replacing the ignition switch on my 2000 Mercury outboard was a straightforward job once I had the right tools, wiring diagram, and replacement part. I found that taking my time, labeling wires, and double-checking each connection helped me avoid mistakes and get the motor running reliably again. If I stay organized and follow the proper steps, this is a repair I can handle with confidence.
Author Profile
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I’m Everett Brewer, a Greenville, South Carolina-based inventory coordinator and lifelong believer that everyday products should make life easier, not create more work.
Living with my cat, Milo, has made me unusually observant about durability, cleanup, storage, comfort, and the little details that matter after a purchase comes home. Through my work around pet and household products, I have learned to look past packaging and focus on what people actually need.
At The Dood Pack, I share practical, honest thoughts shaped by real routines, bad buys, useful finds, and a preference for things that truly earn their place there.
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