I wanted to have a constant 12volt hot so this is what
I did Inside on the left bag where the usb is at. There are 3 screws where the latch is 2 on one side and a single screw towards the front of the bag and that's the one to use. I took the rubber grommet out and ran the wires to the battery and put a 15 amp fuse in also. Then put the grommet back in.