I have a 99 Polaris XC700 . I am trying to hook up a 12V plugin for my GPS. How do i test for a hot wire . I used a volt meater but I could not get a reading .Un hooked the yellow wire off the regulator and started up the sled to test and the low beams burnt out Will the voltage change dammage my GPS? Can I Hook it to a wire on my headlights?