i have a 6 volt positive ground tractor. the question i have is i have 3 6 volt lights that i want to hook up to what kind of switch? i want 2 light in front and 1 in back. now the lights only have 1 wire coming out of them. With this tractor being positive ground do i hook the 1 wire up to switch for ground and the positive will be the bolt that mounts the light to the machine? so i'm kinda confused about the positive ground concept or do i hook up the lights as you would in a car or truck? what type of switch do i need? do they make a special one for turning on front lights and not back one or vise versa the back one on and others off? is someone could please help and give me a diagram of what i'm supposed to do is greatly appreciated.