A distributor cap is one of two vital parts (the other being the rotor) found in distributors, an electrical-mechanical ...

This type of ignition system with a separate ignition coil -- a rotor in a distributor that sends electrical current to each spark plug through wires in the cap -- began to phase out in the 1970s.

The group, made up of auto enthusiasts who love to ... As the engine began to run, the clear distributor cap came to life, with the spinning rotor and high voltage spark clearly visible through ...