1 Way Light Switch Wiring Diagram Australia – The visible difference from a regular switch along with a 3 way switch is one more terminal,or link. A 3 way switch has 2 terminals which are either gold or brass colored and another terminal that is darker colored. The sterling silver or brass terminals are known as travellers or messengers and also the dim colored terminal is referred to as the normal. If all three terminals appear comparable in coloring, the common terminal is going to be identified by the word “common” stamped on the rear of the switch.