Thanks for the help. Hooked them up friday (used 2 switches) & went for a long ride saturday. 2 swithes is for sure the only way to go. The $20 grip heaters get much hotter than the $30 thumb warmer. I can say after saturday I will not put my handlebar mits back on. They work ok but aren't near as nice as heaters, also didn't like them on when hauling ass and riding aggressively. Only problem I can see now is the whole family wants them. So i'll be shelling out another $150 for heaters and i'll have to wait a little longer for a pipe. Best $50 I spent on winter riding gear.