i got it wired up but the light dont come on and when i step on the brakes with a test light on the blue wire there is no power coming out and the light still dont light up.my buddy that gave it to me said i have to be hooked to a trailer for it to work.i gotta change my trailer plug.the trailers we have have the 7 round pin plugs and my truck has the flat blade 7 pin
Check your fuse box under the hood. I was missing two fuses needed to make the brake box work on my truck, when I put'em in the lights and brakes worked.