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heater blower motor not working

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I have a 1998 STS which the heater blower motor is not working. To date i have removed blower motor and connected battery power to center connector and ground to the far left of connector and the motor spun. Not sure on what the third connector does, guessing its a signal wire. Went back to connector and got power to center and good ground on left side and nothing on right thats with the control turned all the way up . No Power or ground continuity. Can someone please send me a wire diagram and any information on the values i should be getting at the wires.

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