I want to put a 2nd battery in the cabin to charge from the alternator and isolate manually with a 1-2-off isolator, to keep it simple. I only want to power an electric cool box (fridge to come later) and 1 LED light. What's the best way of getting the power through from the engine bay to the cabin.
I have a 2003 Patrol GR 3.0l auto.
Thanks.