My neighbor has z254f that I am trying to help get going. I have seen similar post with this problem but no solutions. At first he said it would die when he engaged the pto. I didn't have a problem with engaging the pto. It would die when I moved the left control arm. I checked all safety switches and relay. I have not found the problem and now it dies when either arm is moved. I have all new safety switches plugged into the harness where I can control them by hand trouble shooting. I have checked continuity on wires from pto clutch between the switches, relay pto switch with no break. It cranks ant the pto engages no problem till I release one of the safety switches for the control arms. Thanks.