2018 star golf cart 48v not turning on

[s6golfcart]

i have a 2018 star golf cart 48v when i turn the golf cart on it doesn't turn on and i have 0v on pin j1-4 if i put it on negative side battery, but if i put it on positive side on battery i have pack voltage. Do i need a new wiring harness? can someone please help
thanks

[s6golfcart]

the controller is a Curtis 1268