Balmar 170A 12V Dual Foot J10 Serpentine Alternator

Balmar builds alternator power upgrades specifically for marine applications rather than adapting automotive parts to a boat. High reliability bearings, robust rectifier diodes, and improved heat-sinking go into every unit, which matters on a boat where the alternator runs longer and hotter than a car's ever does.

This model puts out 170 amps at 12 volts, a serious jump over a stock alternator's output for a boat that runs a lot of house loads off the engine while underway. The 3.15-inch dual foot saddle mount pairs with a J10 serpentine pulley, matching the mounting and belt style many marine diesels already use.

That combination of high output and a factory-style mount makes it a straightforward upgrade rather than a project requiring custom brackets or belt routing. Explore more marine alternators.

• 170A output at 12V
• 3.15" dual foot saddle mount
• J10 serpentine pulley
• High reliability bearings and improved heat-sinking