Heard of a locking differential that uses an electric magnet to lock. It's an interesting idea. Supposedly, the electromagnet is in the differential housing with only two wires coming out - no motors, no compressors or air lines.

Anybody heard of this?

Suggest you delete this double thread before you become newbie of the day. :flipoff2:

Electromagetic, haven't heard of one, but there are folds (Tractec) that are working on electric based selectable lockers.
Might this be what you mean?