Having an electrical problem with my fan blower circut. I've been trying to get the fan working to blow the excess fumes out of my car, but literally the second I turn the key to "on" the fuse for the fan blows, even if it's switched off. All of my electrical connections/grounds are clean and tight. I know the fan works because I jumped it from the battery directly and it turns in and moves a considerable amount of air. Could it be a bad switch?