Rodger,
I had it wired 3 different ways and since the voltages were within .2 volts of each other, I went and left it the easy way....
1) Ran wires out of the box, by making a small hole or notch so the wires don't get pinched, and run the to the battery...
2) Run the wires to the alternator + and then 1 key and 1 ground
3) THE WAY IT IS NOW - See the 2 red leads in front of the box ?? Those go directly to the battery, SO I grounded the unit, Tapped into a keyed on fuse under the cover, and the + is bolted to the stud for the + in front of the cover..
I can take pics if you would like.
Todd Z