mjroman20 is correct. The factory default settings in the Curtis controllers are so broad that most pedal sets in RXVs will pass the poweron test. However, they are really too broad for decent performance. Since your cart is not passing test, you may have damaged your controller. When you connected the white wire wrong, you connected a 10 Amp fused KSI wire to a Motor Brake circuit in the new controller. That circuit can only sink 3 Amps before it fries the FET that switches the motor brake coil on and off. There is also a shunt on that line that measures current flow, which when exposed to too much current it can destroy the input that is connected to it.
The conversion kit is not the best way to integrate a Curtis upgrade controller into a Danaher controller cart. The conversion kits are prone to corrosion and do not last too long before issues arise. I suggest the harness conversion using the instructions posted here...
http://www.buggiesgonewild.com/elect...ocumented.html
The controller can be repaired, I've done it before.
http://www.buggiesgonewild.com/elect...ml#post1349615