I have a 20' flatbed equipment hauler. It has a 6-way metal plug on it and, it works fine with my 2005 chevy 2500hd. I bought a new 2010 ford f250 4x4 put a new brake controler in it and a 6-way to 7-way adapter plug and now as soon as i hook up the trailer to the ford and move 5' the trailer brakes lock up completly. Also, thats without touching the brake pedal at all. I also have a dumpster trailer that my new truck and adapter works fine on so its gotta be the trailer right?

just some ideas plz

Justin, February 2010

The problem is probably the 6 to 7 adapter. No one ever tells you there are 2 accepted methods trailers are wired. This should help. http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=250763369505&viewitem=&sspagename=STRK%3AMESELX%3AIT

Jerod, January 2011