The Wiring - How Turn Signals Work | HowStuffWorks How Turn Signals Work. by Karim Nice. The Wiring. Prev NEXT . Let's take a look at how the turn-signal circuit is hooked up. The turn-signal circuit gets power when the ignition key is on. The power goes through a fuse panel into the thermal flasher. From there it goes to the stalk on the steering column.Author: Karim Nice Videos of turn signal wiring schematic Click to view on YouTube6:52Turn Signal DIY Wiring Schematic9 views · May 4, 2018YouTube › BobEaseShopClick to view on YouTube9:24turn signal flasher INFO and wiring mechanical 2 prong old style EXPLAINED75K views · Sep 14, 2017YouTube › Chris CraftClick to view on YouTube2:28turn signal wiring347K views · Oct 28, 2012YouTube › totallyredviragoSee more videos of turn signal wiring schematic How to Add Turn Signals and Wire Them Up A quick and cheap way that works just as good is a tail light wiring converter for trailers. They will combine the brake wiring and the turn signal wiring so they will work. They look like this: You can get them at places like Napa or here: Some have the tail light wire running through them (4 wire into 3 wire), and some don't (3 wire into 2 wire).