ORIGINAL: thermal7
Those 3 motor wires look very closely bundled and be sure they are not shorted together or any connections touching the motor casing. I know this is highly unlikely but these 3 wires should be not touching each other or anything else. If they were to short together any 2 or any 1 short to the motor casing, you would have a problem.
Ralph
Ah good eye. They might indeed be shorting out.
Also, i like the way you have your battery mounted, i think i will change mine over to that