Does anybody know what the correct voltage should be running to handwarmers on a sled? My daughter has one warmer that doesn't work and I checked the voltage to it and is showed about 1 volt flowing to it. The other side works fine and it also shows 1 volt flowing to it. I checked my sons sled, both older Polaris Supersports, and his shows close to 3 volts flowing to each side. Which is correct and does it matter?