Solar regulator connection points

Hi, we are planing to get 2 x 140 watts flexible solar panels connected to our 2010 Flying Cloud. It's solar prewired, with one end near top vent, and terminate under the bed (green and yellow wires).



This is what it looks like:





I would like to ask to see what is the best way to connect the regulator to the battery? Do I connect the positive and negative wires to the terminal bus or will I need to pull new cable to reach to the battery outside?



Thanks for your advice! :blush: