Mercury Solenoid SW275 is manufactured by ARCO Marine. The first to introduce Original Equipment replacement parts tested for high quality and exceptional marine parts that meet the standards. Their products are tested first before shipping. Thus, they have the lowest product failure rates in marine engine production. The Solenoid s purpose is to actuate the outboard motor starter comparable to remotely activating the switch. It requires a considerable amperage to operate a motor starter therefore, it also needs a specific diameter wire dimension to carry the load. The solenoid terminals consist of large wires connecting to the starter. The SW276 can fit Mercury. Key Features: OEM part includes four (4) terminals Isolated base, 12 volts 1 Year Warranty Specifications: SKU: SW275 UPC:693006001715 Weight: 1.00 lbs Isolated base: 12 volts Fits: Mercury Replaces: Mercury 89-68258A4, 39-76545T, 57-SW275, 693006001715, 69300600171, Mercury 87-61053, Mercury 89-76545T, Mercury 89-76545, Mercury 89-15857, 89-15875, Mercury 89-68258, SW-275, Mercury 89-853654A1, Sierra 18-5815 Isolated base. 12 volt. Fits: Mercury. Replaces: Mercury 89-68258A4, 39-76545T