I had a brake controller installed on my Dodge today. I decided to wire the trailer side 7 post harness myself. Trailer lights function properly... But the brakes are very weak. I can fully engage the brake controller and only feel the slightest hint of brakes being back there. The two wires that came up from the brakes were both wired to the harness. Do you think it could be a weak ground that needs to be grounded to the trailer instead of the harness?