Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
With RXV, batteries are most important. D you have a voltmeter to test the battery pack and each battery? Hw old are the batteries? RXV has to have 48 volts or the electric brake will start to drag and slow cart, or lock up the wheels! I'm thinking you have a bad battery or cable in the battery pack. One battery affects the whole pack. Like a weak link in a chain!
I see question is still open, did you see my response?