Thanks to both of you feels great to have support this forum is new to me, is a good idea to swap displays as is so easy..but...the fault happens before the display acts up....is only then when keeping a hold on the grip full speed that the bdi dissapears...looks like a pmt trip...guessing the transistor fails to turn off or on at high currents....by the way the mast cables were also replaced since this truck is from 1997 very old but we keep it mint..the parts came in...I will let you know...again thanks!!