It's just my opinion but I think the controller you ordered is too light duty for a lifted cart with large tires. With a lift and big tires the recommendation is 400 amp and up (DCX series).
From the Alltrax website:
QUOTE NCX Product are for Factory Motors Only:
These units are designed for OEM (Original Equipment Manufacturers) stock
replacement controllers for stock cars with stock motors only. With a peak
current rating they are not designed for lifted or high performance vehicles.
The design follows the motor manufacturers current and power
recommendations.
I would give Alltrax a call and discuss it with them: Phone: 541-476-3565 or
[email protected]