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Message: <blockquote data-quote="Dave T" data-source="post: 115066" data-attributes="member: 20056"><p>On standard flow you cannot hear the auxiliary engage/wine there is no change in motor RPM if you flip The high flow switch on and hit one of the buttons on the left joystick you can hear a slight wine or change of motor RPM. One of my manuals that I purchased for the machine has a detailed procedure on checking the auxiliary control unit. Basically it takes you through the procedures step-by-step on what switches and buttons To push in what sequence to get a voltage reading for a certain wire.</p></blockquote><p></p>