I have been told that I need not run an extra wire to the tail lights to use for brake lights ,,,, when you use the brake lights by pushing the brake peddle down,, this brake switch wire to the turn signal activates a higher voltage that therfore makes the tail lights brighter,, any thoughts on this being a true statement?
Let's put it this way: Follow the wiring diagram for a 7 wire turn signal switch. I can't tell, when you say "extra wire", how many wires you think you need and therefor what an "extra" wire means to you. I also don't know how many tail lights you are using. Assume one each side.
There are two filaments inside the rear light bulbs, as you said. One filament is for stop and brake and is wired from the T/S switch. The other filament is for run lights and is wired from the headlight switch. When making a turn, the T/S switch shuts off the brake switch current to the necessary bulb to allow it to flash. A "higher voltage" is not the explanation. The turn signal switch is an "electrical router".
General rear wiring:
One wire to the rear for run lights, from headlight switch. That wire is split, at the rear, to run to each light (left and right). Two separate wires from the T/S switch go back. One for left turn/brake, one for right turn/brake. Tap into or wire for, license plate light and/or third brake as needed.
The flasher "X" terminal is the voltage input as you say. The device belongs inside the cab.
I don't know much about LED requirements.
There are some main feed wires from the battery for things. These wires should have an inline fusible link where they leave the battery. Otherwise they are not protected. The main battery cable to starter does not need protection.
Last edited by Rusty Rod; 06/27/2018 4:43 AM.
