We have an AC powered, transistorized truck that has an intermittent electrical shoot through. The truck will go into high speed in the forward direction and the only way to stop it is to disconnect the battery. Putting the truck in neutral or reverse won't stop it and braking it will only slow it down. It seems that something is shorting out the system causing full battery voltage to go directly to the drive motors. This is extremely intermittent problem. The truck went 9 months without it happening and then occured twice in 4 hours.
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