Switches - su Amazon AdRisparmia su Switches. Spedizione gratis (vedi condizioni) How to Add Turn Signals and Wire Them Up How to Add Turn Signals and Wire Them Up. a steering column that has a turn signal switch built in. What you need to do is find the wiring diagram for the Wiring a 2-Way Switch - how-to-wire-it Wiring a 2-way Switch, to turn on and off the load. This simple diagram below will give you a better understanding of what this circuit is accomplishing.