axle 46 is supported for rotation within a housing 48 of a locking mechanism positioned beneath the lid well 18 referring now to fig3 as will be discussed in detail below the hook 30 communicates via the axle 46 shown schematically in fig3 with a contact set 52 the contact set 52 provides a three position switch in which two poles 54 a and 54 b connecting to respective terminals 56 a and 56 b in a center position b and disconnect from terminals 56 b in left and right positions c and a respectively where the poles 54 a and 54 b are joined to each other so that in position b a closed circuit is presented across terminals 56 a and 56 b and in positions a and c an open circuit is presented across terminals 56 a and 56 b these three switch positions a b and c correspond to three positions a u2032 b u2032 and c u2032 of the hook 30 the first hook position a u2032 is where the forward tooth portion 28 of the hook 30 remains retracted behind the vertical wall 32 of the lid well 18 the hook 30 may be in this position prior to the hook 30 being actuated or if the hook has been actuated but was obstructed or jammed or if the actuator fails in this position an open circuit is presented across terminals 56 a and 56 b the second hook position b u2032 is where tooth portion 28.