I ran my cable through the wheelwell and along the passenger side rocker panel mimicking the routing of the trunk wiring harness that goes along the driver's side rocker panel. I ran it outside of the car through the kick panel vents, and through existing holes, to the engine compartment. I use blue heater hose (my car was blue, so I thought I'd keep the "Ford Blue" theme going.) slipped over the cable before the terminal was crimped to protect from abrasion and grommets where the wire passes through bulkheads. A trunk mounted solenoid is a good idea as the main cable is only "hot" during starting, but I haven't done that yet.