I ran mine a short distance thru the floor, to the frame underneath the cab. Really ground a good clean spot, smeared some dielectric grease there, and used a large flat washer, bolt nut and lock washer setup. For the positive battery cable it runs all the way to the starter per wiring schematic! I also used very heavy gauge wire for the battery cables due to the longer than normal runs. I then have a ground strap running from the frame to the engine block, and will do the same with th body once all the pieces are back together.