Here is a link to Essex Manufacturings website for tire kits, it has UTV rated tires and the radial street tires mentioned earlier
http://www.essexmfg.com/ATV/index.stm
Here's something else to look for. If you pulled the switch and had 12 volts to both terminals in the ON position and 12 volts to only one terminal in the OFF position, its possible that the wiring connection to the switch is/was the problem. If you were getting 3 volts to the lights the...