So I have a 2016 GMC 3500HD Duramax. When I built this truck and ordered it, I had them add 4 AUX switches in the dash from the factory. It is a service truck for work, so these switches are for flood lights, caution strobes, etc. I cannot find anywhere to connect to these switches to control our equipment. Has anyone had to deal with this or can help me out to find these? Thanks.