Automotive Authority Ignition Key Switch For Mercury – 3 Position Off-Run-Start (87-17009A5, MP51090)

Mercury boat owners, this one's for you.

If your ignition is acting up, grab this Automotive Authority replacement switch.

It's a 3-position: Off-Run-Start.

Simple, direct fit.

Part numbers 87-17009A5 and MP51090 cross-reference perfectly.

Brand new, in original packaging, ready to install.

Whether you're on the water or doing maintenance, a reliable ignition is key.

This switch gets you going without drama.

California residents, check the Prop 65 warning, but otherwise, it's good to go.

No UPC, just solid quality.

Made to get your Mercury running smooth.

Perfect for DIY replacement—just wire it up and you're set.

Don't mess with sketchy old switches.

Get this fresh one and hit the water with confidence.

Automotive Authority knows marine stuff.

Order now and replace that worn-out ignition.

Simple, durable, and ready to ship.

Start your engine the right way!