Editing Spark plug (section)

====Terminal====
The top of the spark plug contains a terminal to connect to the [[ignition system]].  Over of the years variations in the terminal configuration have been introduced by manufacturers.  The exact terminal construction varies depending on the use of the spark plug. Most passenger car spark plug wires snap onto the terminal of the plug, but some wires have eyelet connectors which are fastened onto the plug under a nut. The standard solid non-removable nut SAE configuration is common for many cars and trucks.  Plugs which are used for these applications often have the end of the terminal serve a double purpose as the nut on a thin threaded shaft so that they can be used for either type of connection.  This type of spark plug has a removable nut or knurl, which enables its users to attach them to two different kinds of spark plug boots.  Some spark plugs have a bare thread, which is a common type for motorcycles and ATVs.   Finally, in very recent years, a cup-style terminal has been introduced, which allows for a longer ceramic insulator in the same confined space.<ref>Notice the back inside page of the 2015-2016 Champion catalog from Europe.</ref>