I have an 04 1500 Ram that does not have the plug under the dash for the brake box. I am installing the 7-round plug on the rear and I need some help wiring in the brake box. I know the white goes to ground,black to the battery or fuse box and blue to the brake box. But I need some help wiring the box to the truck. How should I wire to the brake control sensor? What other wires will come on the box? Thanks in advance

You may want to ask this in the 3rd Gen section. I'd hate to see you get bad advice as there may be differences between the 3rd and 4th gens.

If you go online and google etrailer.com. This page may be able to help. I did that when I put a 7 wire plug on my trailer, and wired it to my old truck. The other thing you can do is, get a good test light and check the wiring. Also sometimes your trailer brake control will have a diagram on how to wire it also.