Abstract: A technique includes providing power to a group fuel cell system components and providing sensors to monitor conditions of the fuel cell system. The status of each sensor is associated with a switch, and the switches are serially coupled together. The delivery of power to the fuel cell system components is regulated in response to states of the switches.

Abstract: A ski attachment for pivotal attachment to the axle or transverse rod-like member of a wheeled vehicle which comprises at least one ski having an elongated runner with an upturned front tip, an upstanding pedestal mounting on said elongated runner behind said front tip, said pedestal having an upper distal end with a transverse recess or like means formed therein for pivotally receiving said transverse axle or rod-like member of the vehicle, said pedestal and ski having a total height greater than the radius of the vehicle wheel, and tension biasing means interconnecting the front tip of the ski to the vehicle above the axle for urging the front end of the ski upwardly relative to the vehicle whereby the mounting of obstacles during forward travel of the vehicle is facilitated. In a preferred aspect, the ski attachment of the invention comprises a pair of skis, with means for securing the skis together in spaced side-by-side relationship.