I am trying to hook up my 3rd brake light on my cap..its on a 2010 stx...
I have read that there is a green wire that Ford left us just for this purpose..green wire sticking out by itself labeled es-1 directly under the master cylinder..shrink tubing over the end of it
I checked the wire for power with the brake on/off...it does get power when the brake is on..
tried to pick up a temporary ground near the tailgate stiker post to verify that this will work..now I have no power on this green wire..
can't seem to find a blown fuse.
what am I missing?
should I have used the ground/black wire near the fuse box on the radiator support...it sticks out like the green one and it is labeled es-1 as well..

looked at the wiring hook up on here before I thought but searching doesn,t show anything for me..

thanks