On the top horizontal bar, drill from the water drain hole into the vertical bar. At the bottom of the vertical bar were it bolts to the body there will be 2 drain holes about 5/16-3/8". You will need to unbolt the cage to lift it up to access these holes. You can then fish mechanics/bailing wire through one of the lower holes then up to the hole you drilled at the corner of the upper horizontal bar & vertical bar. Tie the wires you want to pull through to the mechanics wire or whatever you use then pull the wiring through the cage. Everyone has their own methods but you will want to make sure your positive wire has protection from possibly rubbing through or pinching in the cage. I put a medium wall heat shrink over my power lead then pull the wiring through the cage then put a heavy wall heat shrink over both wires(power&ground) where it goes throught the holes drilled in the cage.