2013 Yamaha YDRE I have replaced the controller, the relay, the wiring harness, bypassed the stop switch (It checks good) batteries 50.2v, motor runs when power applied direct to it, have two TPS that appear to read resistance and will vary voltage from 4.04v to ,29v. Bypassed what appears to be good ignition switch. still nothing. Relay clicks when run/tow switch activated, reverse buzzer works when in reverse but doesn't go all the way to ground (will drop to approx. 30v, then returns to 50.2v). disconnected charging safety plug. Have ordered Speed sensor for motor (Hitachi), new TPS and ignition switch. The only time the wheels (on jack stands) have turned over was when I was working on checking the TPS and stop switch. Happened one time and then stopped. Does any one have the silver bullet as to what is wrong. I have 3 controllers, one brand new but something is stopping the controller from turning on, Fuse is good. Supposedly worked on by 3 mechanics prior to me buying it without any luck.