Try Roadmaster for a switch that will allow you to tow and not run your battery down. I purchased one from them for my 2012 Honda CRV so that I could tow and not have a dead battery. I was able to install it myself. Very easy procedure if you're able to lie on ground and reach under dashboard to locate the fuse that you need to remove and install the switch wire, reinsert fuse into that line and drill a hole in dashboard. Easy fix.