heat/defrost motor that comes out into the passenger side engine compartment? I have three wires, most wiring diagrams show two.. I have a black one with a ring terminal that appears to be a ground but when it is hooked up the blower it is alway on (even when switch is off) and there is no off, low medium of high ..only high. I know two connect to the brown & yellow that come off the engine harness that run on the shock tower support but were does the black one with the ring terminal go?