Ignition Coil 1.5 Ohm | Sierra 18-5437 Sierra Ignition Coil 1.5 Ohm | 18-5437 Standard 12 volt marine ignition coil is designed to be used with external resistor. 12 volt 1.5 ohm ignition coil Replaces Crusader 37068 | Replaces OMC 383444, 378231, 3852217 | Replaces Volvo Penta 3852217 | Replaces Prestolite 5-69 | Replaces Mallory 9-29705