Originally Posted by meridian
On my motor, the case is the negative point.
I'm not sure what post you're responding to, but a windlass that runs "both ways" does so by reversing the polarity to the motor. In the case of my Lewmar, if one power lead was connected to the windlass housing, it would be negative in one mode (up or down) and positive in the other.
I'm not at my boat (or even near it), but my money is on no electrical connection to the housing.