wiring expo visors

[mcdonald58]

hey guys im going to attempt to wire in my expo visors but ive got a few questions. i know i have to tape into my map light power but which one is it? also does anyone know what gauge it is so i can get the right tap connectors. any tips on grounding would be much appreciated. im thinking ill just wrap a wire around the spring and then put a ring terminal and put a washer on bottom and top then put the screw in. i really dont want to put a hole in my roof.

 

[Scrambler82]

I do not know what wire it is and I am not trying to be a @ss but can you drop the Map Lights and see what wire goes there.
I will be doing the same wiring this summer so if you find the correct wire pls post.

Also, watch out if you probe the wires, Ford uses a lot of Ground-switched circuits so power will be in the wire and all it will need is a ground and you could interpret wrong.