An ignition system comprises an ignition coil assembly (100) that supplies a high voltage electric current to a resistor-type spark plug (20). The ignition coil assembly (100) includes an ignition coil (140), a high voltage coil terminal (120), a terminals connecting insert (30) and an insulator (40). The terminals connecting insert (30) conducts the high voltage current from the ignition coil (140) to the resistor-type spark plug (20) by connecting the high voltage coil terminal (120) of the ignition coil (140) to the electrode terminal (22) of the resistor-type spark plug (20). The conductor core (32) of the terminals connecting insert (30) is formed of electrically conducting elongated fibers of carbon fiber or graphite fiber. A conductor supporting body stem (34) of the terminals connecting insert (30) forms an insulating and protecting layer around the outside of the fiber conductor core (32). The insulator (40) provides a passageway to house the high voltage coil terminal (120), the terminals connecting insert (30), the electrode terminal (22) and portion of the resistor-type spark plug (20). The insulator (40) can be detachable as a separate component from the high voltage coil terminal (120) of the ignition coil (140) to form a detachable-insulator (42). The insulator (40) can be non-detachable from the high voltage coil terminal (120) to form a non-detachable-insulator (44). The non-detachable-insulator (44) is in a form of an integral part of an insulator (40) with the ignition coil (140).