I realize this is old thread. But at least I'm using search function.
I'm looking to set up my Prodigy brake controller on my "new" 07. I didn't see any available socket for me to plug in the harness. I had to unplug the existing harness labelled "Instrument panel feed", then I can plug in the brake controller harness on the grey socket. Is that right socket to plug in? What's the instrument panel feed harness for then?

Thanks in advance.

 

Does anyone know the part number and price for the R5 relay? I have a dump trailer and usually just keep it plugged into a trickle charge.