I am currently working on this scissor lift,original problem was that speed pot on original joystick became faulty and was not a repairable unit.We installed an aftermarket retrofit joystick that was supposed to be a direct replacement with just a few wiring changes,once installed the unit now has only high speed immediately once travel is enabled.I have gone as far as checking all wiring and even in stalling a new joystick unit.Any help would be greatly appreciated.