Greetings Folks.

I have a an Electric Yale,
Mode# ERC050JAN36SE083
Serial# 480353

It has recently acquired a really nasty issue. As you start to pull away everything is fine. Then suddenly it jumps to FULL SPEED regardless of the pedal setting. This instantly spins the wheels, generates a massive jerk, and then it stops.

Further application of the pedal sometimes results in a repeat but often nothing happens at all. You need to turn off the ignition, return the direction lever to neutral, turn the ignition back on reselect the direction and try again. Often with an identical result.

Vague associations include steering all the way to a stop or going uphill is rumored to increase the incidence. Driving over very minor floor cracks has also been mentioned as a precipitator of this behavior. Once it seems to get in this "mode" it may behave this way continuously. To the point of being completely non-usable.

It has slowly developed this trait over a month. To where it is completely unreliable now.

I have carefully gone over all the signals going into the EV-100 screw terminals. They are just as expected.

I have gone visually over everything I can see - no obvious loose or frayed wires.{dang}

It should be noted that you can press the pedal down until motion is just occurring and hold it right there. The FL will start to roll getting perhaps six inches and with no bumps or further pedal motion have one of these "events" occur.

Suggestions for further investigation?