GZP Thunderbolt ignition coil 12v chrome

Improved version to the classic round-style coils. Internal windings are 100% immersed in a genuine oil-filled jacket which cannot become brittle or crack like in cheaper versions. Available in a 6 Volt and 12 Volt version. Replaces the OEM coil on 1947 and up Harley's. Produces a 10% higher output than the stock coil.