there is a pair of diagrams here that show where everything goes, but be carefull of which end of the plug the diagram is refering to( turn signal wires always concide with what signal they are for ie; right turn signal wire goes on the right hand side of the truck plug when staring at the tailgate)
http://www.etrailer.com/faq/wiring.asp
The reason I suspected you are using a 7 to 6 adapter is, pretty much any truck that comes from the factory with a 7 pin, is going to have it wired to industry standard, the same with pretty much all RV and car trailers sold in the last 10 years.
Where the problem comes from, is the 6 pin plus, also refered to as a horse trailer plug, or a construction plug.
No(or atleast very few) trucks came from the factory with a 6 pin conector on the back of them, so the industry standard is less prominent. This is why you see alot of trailers(mostly horse trailers) with six connectors wired "wrong" with the brakes in the center pin. Most of those trailers also have no break away kit, so it's not so much of a issue of having the 12V and brake wire swapped, but just that "the center pin seemed a logical spot for brakes, since it's not used"
Having a plethora of 6 pin trailers out there with the brake pin backards also means there are plenty of trucks out there with the 6 pin plug wired backards.
This is why you have Joe Shmoe's trailer is wired backards, but he thinks it's right, because it works on his truck, as well as uncle bobs truck, and the old farm truck.(because all three have incorrect 6 pin plugs) Then When his friend Tom goes to borrow it, he use's a 7 to 6 pin adpater plug, and the brakes stick on.
Because tom's truck is wired correctly, the adapter is correct, but the trailer isn't, so the problem comes up.
Infact, I've dealt with the backawrds six pin on borrowed trailers enough times, that I'm going to instal a relay under the hood hooked to a switch, so I can change the configuration on my 6 pin to suit the trailer I'm pulling, by simply flipping a switch.
Linear Mode
