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It could possibly have 5pins instead of just the three.should I assume that the 2extra pins at the back are just for stability or are they like an on/off deal like on the one below or is the one belows on/off function seperate from the 3main pins? With the one below if you labelled the pins 1-5 with one being the most left going counter clockwise and the 3main pins being 2,3&4 you would run the positive thru 1 out 5 then to either 2 or 4 with 3going to the motor+ right?
In the above post I'm assuming that the pot I took the foto of works the same as the possibly 5pin pot on the Pwm circuit board above.if I'm incorrect and should just bridge the 2back pins then let me know.