Electrical connector and ignition apparatus for an internal combustion engine

An electrical connector for connecting a high voltage terminal of a spark plug of an internal combustion engine to an ignition coil, comprising:

• first and second electrically insulating caps adapted to be attached to the spark plug and the ignition coil, respectively, said insulating caps each having a cylindrical engaging surface;
• an electrically insulating sheath having at its opposite ends cylindrical engaging surfaces which are in engagement with said engaging surfaces of said insulating caps, defining at least one cylindrical engaging interface therebetween;
• an electrical conductor supported by and extending through said insulating sheath for electrically connecting the ignition coil and the high voltage terminal of the spark plug to each other;
• and
• electrically insulating means, disposed in said engaging interface between said engaging surfaces of said caps and said sheath, for providing additional electrical insulation in said engaging interface, said electrically insulating means comprising a pair of circumferential annular ridges disposed on one of said engaging surfaces and a pair of circumferential annular grooves on the other of said engaging surfaces for receiving said pair of circumferential annular ridges therein, one circumferential annular groove of said pair of circumferential annular grooves spanning a larger annular diameter than the other circumferential annular groove of said pair of circumferential annular grooves.