Thanks but they are working ok. I can get it to move in both directions, every time, by putting my foot slowly onto the "throttle/move" pedal. I start very slowly and it moves slowly,as one might expect. If I put foot harder down on the pedal the FL starts to increase in speed and then if i take foot off quickly and back on again the drive has "tripped out" and FL stops. I switch off and back on again and can repeat numerous times. I do not want to move too far because if it is something that stops me in a difficult place the whole firms operation will cease. This indicates to me that it is something to do with the rate of change of input to a drive module. I am told there is a potentiometer connected to the pedal.There are 4 leads coming from the unit under the floor that the pedal operates. There will be two ends to the potentiometer and usually one that varies as the pedal moves making three however there is another fourth connection. Any info on this please,