Even though electric carts don't use chassis grounds, it still isn't good that those two cables are held together by a nut and bolt in mid air. Like Nick said, without the resistor installed, the cart will be very jerky, even jerkier than stock.
If you really like the cart and plan on keeping it, consider upgrading to a solid state drive system. I did a poor man's conversion a couple of years ago on mine and love it.