Sierra 18-5181 Ignition CoilSierra high-quality engine parts are designed to meet OEM specifications. Replacement ignition coil for Johnson/Evinrude and Mercury Outboards.Features: Primary Resistance: .09 A 10 ohms; Secondary Resistance: 10 A 15 ohms; Interchangeable with: GLM; 72100; Johnson/Evinrude Outboard; 0582995; 0584477; 0580416; 0582370; 0582931; 0580971; Mallory; 9-23102; Mercury Marine; 802371A1; 802371; Applications: 3,4 HP 1950-1976; 4 HP 1981-1989; 5.5.5,6 HP 1950-1976; 7.5 HP 1954-1958; 9.5 Hp 1964-1973; 10 HP 1949-1963; 15,18,20,25 HP 1951-1972; 28,30,33,35 Hp 1956-1970; 40 hp 1960-1973;