I have this controller on my Grizzly. It works well when it worked but it is junk. First the grips started to stay on all the time. Then it got hot and the grips would not work. I wired them up to one of the spare zones and it worked shortly but got hot, so I hooked the grips to a switch and now have only hi and low. (with resistor) They say it can handle 4 amps and they draw 3 so they weren't overloading it. Last weekend I plugged in a set of heated gloves that draw 2.1 amps and burned up Aux zone 1 so I plugged it into Aux zone 2 and burned up it too! Now I have them wired direct. I guess they can only take a small load like the thumb warmer. (1.5 amps.) That is not why I bought this unit. Grips good but grip wear some. Thumb warmer good.