Just bolt it in there and run the wires up to the box next to the battery. In 07s there is a channel from above the passenger's feet to the box with the ECU/BCM/RCM in it. From there, you can poke a hole to exit the box and head to the battery.

YOu can poke a hole in the rubber seal (make it TIGHT, as the box is pressurized when the key is on to prevent dust from entering) and route the wires out...


Use the spare fuse spot in the little box....


You can order 30 amp MIDI fuses on Amazon:




Or, you can use a store-bought crappy fuse holder like I did, until my MIDIs came in the mail:


NOT SHOWN: Ground comes from anywhere you can get it. DO NOT run a ground right to the battery post - ground somewhere to chassis.