ARCO Marine Prestolite Style Solenoid w/Isolated Base

The ARCO Marine Prestolite Style Solenoid w/Isolated Base is a purpose-built electrical starter component designed for reliability on the water. After years running boats powered by BRP-OMC and Mercury engines, any experienced boater knows the solenoid is the unsung hero of engine starts—it's the bridge between your battery's raw power and the starter motor's demand. This isolated-base design isolates the solenoid from ground interference, ensuring cleaner switching and more consistent engagement when you need it most, especially in saltwater or high-vibration environments where electrical noise can degrade performance.

Rated at 12 volts, this solenoid operates on the principle of electromagnetic pull-in: when ignition current flows through the coil, it generates a magnetic field that pulls the plunger forward, closing the high-current contacts and energizing your starter motor. The isolated base prevents stray electrical paths from weakening the solenoid's pull-in force and hold-in capability—critical when cranking a cold engine or operating in wet, corrosive environments. Compact dimensions (3 x 3 x 3 inches) and lightweight design (0.65 lbs) make it a direct, bolt-in replacement without requiring bracket modifications or custom wiring.

This solenoid is the ideal choice for owners restoring or repairing BRP-OMC outboards and Mercury inboards, replacing OEM part numbers 47886, 47886T, 380095, 383622, 389398, 389493, and 395 (among others). Installation is straightforward for anyone familiar with basic marine electrical work: disconnect the battery, unbolt the old solenoid, and secure the new unit in place, then reconnect terminals. Whether you're running a fishing boat, cruiser, or utility vessel, a functioning solenoid is non-negotiable—invest in a proven, isolated-base design and eliminate one more variable from your pre-season maintenance checklist.