Mercury - Quicksilver Solenoid Outboard Electrical System Marine-Grade Construction 8M0185145. Overview. There's something reassuring about an engine that answers the moment you turn the key. No hesitation, just that familiar spark that tells you the day's getting off to the right start. This Mercury Marine part helps create that feeling. When you're easing away from the dock at sunrise or pushing hard through open chop, you want a solenoid you can trust without thinking twice. That quiet confid