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The unknown wire is for contactor control. When you get to fine tuning stage (using RTD explorer or such) you can set the delay after which it outputs +12V. It is intended to close main contactor after preset amount of seconds after controller is turned on. There might be a pre-set value if your chip is preprogrammed. You don't have to connect that contactor control wire anywhere.
Connect your controller to a computer if you can. You could download RTD explorer and see if your controller output serial data. You'll get some nice real-time graphs and ability to tune different parameters. No serial output - problems. Oh, there are two leds that are supposed to lit when controller is powered up. Then it is o'scoping gate resistors for proper signal. I didn't do it, I was happy with serial output and went to test the controller with motor and 12V starter battery. Don't connect your full pack voltage there right away, simple 12V test should be safe. Use separate batteries for powering controller and motor.
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