I'm an old geezer and a retired carpenter and I do all of my own fixin'. I have a 1990 Dodge W250, 5 speed 4WD rig with the Cummins 5.9 and a Gear Vendor and it only requires one battery to operate and for no other reason I wouldn't own any other make of truck. It's been a good rig. The one problem I've had with it is a slow battery drain so that if it sits for a week it won't start. If I use it every day or so, no problem. Originally got it to haul horses and hay but that's done and now it doesn't get used too much. At this point I've been just disconnecting the battery but lifting the hood on this guy is a chore for this old man. Dodge could have used stronger spring on this and there'd be no problem, but they didn't. So I want to install a battery disconnect switch in the cab. I don't know how many amps this draws for starting so I need some input on what size cable and switch to get. Will 1awg work or should I go bigger?