Is the ali box maybe some sort of voltage regulator? Not sure, just a guess going by what its connected to. You can keep the gyro, but take it out while you're trying to problem solve as it just adds another complication to everything then add it in if you really need it when its all working properly.

Test the Roboteq independantly, straight to a battery and motor like Gary says and establish that that isn't the problem, then go from there and add in components that are needed one step at a time.