[Jon Stratis]

What is your drive train setup? If you have a 4-wheel drive with traction wheels, it won't be able to turn very easily (especially if you only have 2 CIMs on your drive train!), and you could be stalling the motors. When they stall, they draw enough current to trip the circuit breakers, which is probably the clicking you hear (they reset, then trip again, then reset, etc).

For your ball lifter, is there any friction in the system? If something is out of alignment, you could be making that CIM motor work a lot harder than you expect, and it too could be tripping the circuit breaker.

Also, check to ensure your frame is electrically isolated - there should be an extremely high resistance between the input terminals and the frame. If not, then you have a short somewhere that could also be causing problems.