On my Kenwood, it also has 2 USB ports. I put one up through the dash for my phone mount. And then I put the 2nd one into a USB Port that fits into the stock switch location. See the bottom right plug. Yes, this is MyToy's mount, but those are stock switches and holes so you could put it into any of the unused stock switch spots. The plug is supposed to be waterproof and I have not had any problem with it.
chavey2 nice work. how did you hook-up the USB port in the dash through the stock switch location? Is there an adapter plate included or did you buy or fabricate one?