Hi John,

Had a good hunt around my garage for info found some incomplete notes, Trev B I think is on the right track as I recall the battery lock down pin assy against the driver side bulk head at the base of the seat box dose operate a switch assy and they do give trouble. I think it's more of an adjustment problem some part of the linkage becomes worn, I think you need the battery out and the foot plate up, as I recall I always thought it was a bit of an arkward job to sort.
Also on this truck I believe there is a fault code indicator on the micro pulse board in the form of a window when things are ok a figure 8 is displayed in the form of straight lines with a Decimal point (.) at the bottom right hand corner. When a fault is displayed the point is not present and the figure 8 is incomplete ie if a figure 2 is displayed then the probable cause is direction switch or wiring. Check to see if you have a fault code displayed.

Regards Titus