I just bought a used 03 last weekend. I'm wanting to hook up my brake controller but I don't know where it goes. Is there an adapter harness of some kind I need? I found a blue plug on top of fuse box. Is there where the adapter harness goes?

 

Does it have the trailer tow option? If so, they will be a blue plug under the dash, left side of the steering column up high in the mess of wires. Get the pigtail from the dealer.

 

yes it does have the trailer tow option.

I think I've found the blue plug you are talking about.

Thanks for your help.