I had my second running in series with no on/off switches then decided to change the setup. 1st time around the battery was mounted where my rear whinch used to be in my rear bumper, nice flat spot,,, but then got to thinking I have had my Toyota Submarine Pickup with that spot underwater so then I thought better move it and add a on off or the other marine switch 1 2 both switch. So I drove to my auto store bought a marine box cheapo plastic $10 and some extra 4ga wire some new terminal clamps and new crimp on ends. The "new" location is in the passenger side corner of the bed that spot has never been under water. I will use the existing drain hole to run the +/- wires throught making sure to use a gromet on the + so that it doesnt rub through and ground out. "FYI the bed has crappy grounding properties". If I could figure out how to reduce my pics enough I'd post em. Oh yea and its an Optima yellow top .
Aaron