Hi All
I bought a 2015 3500HD and it has upfitter switches in the dash. I am installing a small fuel transfer tank and a 12v pump and would like to control the pump with one of the upfitter switches. Problem is I can't seem to find out where the wires are to hook into any of the switches. I called the dealer and was told they have no idea as they have never had to use an up fitter switch. Anyone know how to connect something to the switch? Thanks.