Mercury - Quicksilver Starter Solenoid Outboard & Sterndrive Electrical System Marine-Grade Construction 8M0185149. Overview. There's a moment right before the engine fires, a quiet heartbeat of anticipation - when you trust every part of your system to do its job. That's where this Mercury Marine part proves its worth. You turn the key, hear that confident click, and the engine comes alive without hesitation. Whether you're backing away from the dock or heading out for a long run, this solenoid