need help getting horse trailer brakes hooked up to 2007 dodge diesel pickup 2500?

my truck came equiped with brake box but they are working when hooked up to trailer which also has brakes

2 Responses to need help getting horse trailer brakes hooked up to 2007 dodge diesel pickup 2500?

  1. dodge man October 27, 2010 at 10:25 am #

    let me ask you this? does everything work when its not hooked up to the trailer,if so the problem will be in the trailer not the truck,here’s a web site that has some good wiring diagrams on wiring up trailers on those,good luck, http://www.hopkinstowingsolutions.com/

  2. jeepster October 27, 2010 at 10:25 am #

    That is correct way it should work if you where to plug a 4 flat trailer wire in your trucks receptacle your brake box wouldn’t work.I have 2 utility trailers both with 4 flats when connected to my truck receptacle brake box doesn’t work when I plug my travel trailer in the brake box works.
    Unless you meant that they don’t work?