RenoGuy

I was gonna install this on my chevy silverado 1500 2015 i almost purchased the aux panel and the hardness from harnessDr and the pre terminated wires, then i saw your post. harnessDr make a harness that plugs into the aux box under the emergency break, and seen few videos where it shows nothing about a relay box, whaat was that for ? So if i install the aux panel and run the pre terminated wires straight to the pins in that aux box behind the emergency break it wont work ?