Sierra 18-5437 Ignition CoilSierra replacement engine parts are manufactured to meet or exceed OEM requirements. For 1990 and prior stern drives with breaker point ignition.Features: 12 Volt; Metal Encased; Uses external resistor (For all applications); Shape: Cannister; Specifications: Primary Resistance: 1.45A 15% ohms; Secondary Resistance: 8.5A 20% ohms; Input Voltage: 14+0.5V; Output Voltage: MIN15.0KV; Primary Resistance Tolerance: +15%; Secondary Resistance Tolerance: +42.0H+20%; Interchangeable with: CDI; E18-0002; GLM; 72115; Mallory; 9-29705; OMC Inboard; 383444; OMC Stern Drive; 378231; 383444; 3852217; Volvo Penta; 3852217;