when I power up my GP -7 engine it takes off for a short distance and stops and will not move until I power down the track or reset it and it will do it agene. my other engine work ok
Original Post
Classic indication of a failure of the tach sensor circuitry. First step is to check for a broken wire as the sensor mounted on the swiveling motor sometimes breaks a wire after a few years. If it's not simply a broken wire or loose connection, my top suspect is, unfortunately, the DCDS motor control board. I've had a couple of bad motor sensors, but most often the DCDS has taken a powder.
