Mercury - Quicksilver Solenoid Outboard Electrical System Marine-Grade Construction 8M0185147. Overview. Every boater knows that dependable starting power isn't something you hope for - it's something you build into your engine with the right parts. This Mercury Marine part is one of those small but essential components that keeps the day running smoothly. Turn the key, hear that familiar spark, and you're already in the rhythm of the water. With this solenoid, you get that steady, reassuring re