Mercury - 175-Amp Fuse Block Electrical System Protection Marine-Grade Construction 8M0174088. Overview. When you're running a powerful V10 or V12 outboard, the last thing you want to think about is an electrical failure. Boats this size carry families, friends, and big expectations, and you feel every one of those responsibilities the moment you ease away from the dock. That's why boaters trust the Mercury 175-Amp Fuse Block 8M0174088 - it's the kind of part you install once and forget about, b