Ok, the gauge of the wire will depend on the length of the wire needed and the amperage of the motor.... going to 24v will usually reduce amperage over 12v however your also going to a larger motor as well... I would need to know the model number but you can figure out the amperage and size breaker you need as well from that motor.....
Depending on the length your most likely looking at 10gauge to 6 gauge wire.
A typ 70lb will draw around 40ish amps.... this again needs to be known exactly from the model number.
You can also use this to help you: http://www.ehow.com/how_6071778_determine-electrical-wire-gauge.html
If you use the incorrect gauge in this case too small of wire you will know it as during use the cable will get hot/warm indicating larger cable is needed so it's important to use the right size to begin with to save money replacing it and to prevent a fire.
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