par car starts and then stops

[gopony]

New to forum sorry if this is in right spot. I recently aquired a columbia par car am told it is a 2006. Car was running fine and then just recently stopped. What occurs is i turn the key on, everything appears fine and i hear the controller (I think that is what it is) click on. I then put it in either forward or reverse, again everything is ok. As soon as i step on the gas, the wheels start to turn and then everything stops and i hear the controller clicking on and off, sometimes the battery indicator light on the panel goes off or blinks. I have tried to clean all connections, made sure batteries are fully charged and i am getting good voltage out of them. I can turn off the key, put back in N and then start over with same results. I am not certain how to test the speed controllers, or the main controller or the motor for that matter. Any advice or help would be greatly appreciated