Hi. Please could anyone advise me on selecting an appropriate Ohms and and Watts range for a Potentiometer. This is to energize the speed controller on a car heater blower motor that has lost its supply from the ECU pompously known as the Climate Control ! The blower motor is 12 Volt and fused at 30 Amps and this is the control unit on Ebay http://www.ebay.co.uk/itm/360825657777?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:IT In case this link is not allowed it consists of a pair of MJ11016 transistors. With the cheapest of multimeters I have measured the current when I've feed 13.5 volts in to the activating terminal as a .05 amp blip to start, then motor running steady at .03 amps. With the voltage reduced (by cobbling together various resistors) to approx. 3 volts the current was a steady .01 amps. Thank You for any advice.