your voltages on pins 5 and 6 are probably your issue. they are the inputs to the card from forward and reverse switches. You should have battery volts to 5 when forward is selected and on 6 when reverse is selected you should also have 0 volts on the other input 5 or 6 when the other is selected Check the input to them from the brake switch. if the voltage to the switches fall off when you try to travel then its the brake switch or deadman(right foot pedal) switch.
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