MOST COMMONLY ASKED QUESTION FROM CUSTOMERS.... OVERDRIVE WONT WORK PROPERLY. OVERDRIVE IS ACTIVATED WHEN MOMENTARY BUTTON IS PRESSED QUICKLY ***LIKE CLICKING MOUSE ON COMPUTER* IF PRESSED TO SLOW OVERDRIVE WILL COME ON MOMENTARILY & SHUT RIGHT OFF. THIS IS BECAUSE THE OVERDRIVE ACTIVATION BUTTON IS ALSO THE DEACTIVATION BUTTON , SO WHEN PUSHED TO SLOWLY IT CONFUSES THE OVERDRIVE RELAY TO COME ON AND SHUT OFF.