When I totaled my old wee a couple of years ago, I salvaged the OEM heated grip controller (the grips were trashed). I just got a set of Symtec grip heaters, which come with a SPCO (hi-off-lo) rocker switch. I'd rather use the OEM dial controller, but only if it's PWM rather than a variable resistor, and my internet searching hasn't turned up that info. The unit is sealed, so I'm asking here before just cracking it open to look. Does anyone know how it regulates the heat?