Chicken lights

I have an extra switch in the dash for my chicken, and breather lights. One for each side. It's whatever you want. You could tie in to your breather lights if you don't mind them all coming on at once. It's kind of good for them to be on a separate switch in case of a short.

 

You might be surprised to find that there might be a pigtail already hanging around under the front edge of the cab by the breathers for cab/sleeper lights. They are very popular factory options so Im pretty sure the wires are already there as well as behind the dash for a switch. I think my 386 has wires for lighs and its just a cheap spec'd company truck. A quick call to the pete dealer parts department would give you the best answer and they could even tell you the wire color, how it's labeled, and loacation.

 

Chances are pretty good there's already wires under there. On the 2013 388 I drive the wires are under there with white stickers saying what they are for.