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Message: <blockquote data-quote="RossKean" data-source="post: 1463147" data-attributes="member: 19880">The controllers are PWM, I believe, although some of the literature describes them as rheostats (definitely not).  There are 5 distinct settings and the knob is a multi-position switch (6 including off) rather than a potentiometer. I was mistaken about the ones on my Tourmaster stuff - I thought they were a proportional controller with a on-off duty cycle more like a stove element controller than a PWM.  I mixed it up with a controller I had (built-in by previous owner) on another bike which was indeed 100% on or off on a duty cycle of approximately 5 seconds.I would like to see exactly what the Tourmaster is doing but don't have an oscilloscope available.   I rarely run it above the "3" setting, so I could probably get away with running it with a smaller fuse assuming the PWM frequency is reasonably high.</blockquote>