Hi everyone , new to this great forum with so much useful information. I've just completed rebuilding my 2001 Patrol. I'm just starting to install a twin battery setup and a new spots on the front. I'm unsure of the best route for the new wiring. Some switches have to mounted on dash as well a heavy power cable to supply inverter. I cannot see a direct route through bulkhead. I'd rather not drill only if necessary. Any help would be appreciated.