First replace the trailer light brake/turn signal fuses. I have seen where the fuse will show good, but loose connection in the block. You can easily do it by using the flashers. Using a test light you can check power in and out of the fuse. Just touch the tester to the metal pin on top of the fuse... on both sides. Power in and power out. If power is there on both sides and still nothing below the fuse box, the box is bad. Not a common problem. Also check http://www.etrailer.com/faq-wiring.aspx.
4-Way
5-Way
6-Way
7-Way
Green
Yellow
Brown
White
Red
Blue
Purple
Right Turn & Brake
Left Turn & Brake
Tail Lights
Ground
Backup Lights
Electric Brakes
Auxiliary Power
Green- Right Turn and Brake
Yellow- Left Turn and Brake
Brown- Tail Lights
White- Ground
Red- Reverse (Back Up) Lights
Blue- Electric Brakes
Purple- Auxiliary Power
It sounds like your green and yello wires are shorted together somewhere along the length of the harness. I would check the wires on the trailer first. Easier yet, if you have another trailer to connec or access to another to use for testing, connect to it and see if the problem repeats; if it does the trouble is in the vehicle's wiring.
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do u have power at trl plug,if so its trler problem,if not and wiring is ok,youre truck has a double circuit 1 fuse for truck and 1 fuse for trler package,this system is place in case theres a short in trler wiring,fuse will burn but trucks lights will not be affected,check for trl brake fuse its in int. panel or under hood control center relay fuse box
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