My 1991 300E Blower Motor did not work. I removed it,changed brushes, tightned the endplates. I bench tested with 12 volt battery booster. It worked fine. put in car, connected and Nothing. I got 12 volts from the the feed wires. I pulled current directly from the feed connector going to the regulator(essentially bypassing the regulator) and motor runs. Can I correctly conclude the Blower regulator is dead? If not, what next? if so any suggestions minus $250 or so for a new one?