Abstract: The maximum retention serviceable high voltage spark plug adapter according to the present invention provides an electrical connection between a cable and a spark plug utilizing a stationary terminal crimped onto the cable by a strip and fold technique. Sliding terminals are held against the crimp terminal and a spark plug terminal post by a compression style terminal spring. This terminal spring is also the electrical connection between the two sliding terminals. The electrical connection to the spark plug terminal under all operating conditions is assured by a constant pressure of the terminal spring thus eliminating the possibility of microarcing and fretting.

Abstract: A spark plug boot assembly for interfacing an ignition signal conductor and a spark plug, the assembly including a spark plug boot having a hollow electrically conductive cylinder disposed on an interior boot surface, the cylinder having a flared lower cylinder end extending through the interior boot surface over a spark plug post-socketed terminal contact area, and having an upper cylinder end extending over the socketed terminal including over any crimp section of the socketed terminal. The cylinder further includes a seat for seating a collar about the socketed terminal when a full terminal insertion position is reached.