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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..
Does the trailer wiring relay/fuses etc have to be plugged in?
Well, I had power on that wire only when the brake was on when I started. nothing had changed ecept that I lost power on that wire ..
I spliced into that wire and ran the wire on the ground next to the truck,at the cap,wire nutted temporarily to the brake light and tried to pick up a ground off the tailgate striker post to verify operation of the light...
must have shorted out,but cant seem to find a blown fuse...and everything works cept for power to that wire..maybe took out a relay?
looks like we still have power to the trailer pigtail...
Sure you have a good ground? When I hooked up the third brake light on a truck cap on the 97 F 150 I just had, I had to ground the light to the frame of the truck. Just couldn't get a decent ground anywhere else.
I picked power up for that light from the third light that was original to the truck.
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