2012 built txt48

[Ransom276]

Hey guys I’m at a lose right now with my cart. Built the cart month or so ago. Only thing not new on cart is frame. New Alltrax xct 48500 new D&D high torque motor. 400 amp solenoid. 1/0 wire from motor and batteries. Problem I’m having is d&d field map got the cart to 21 mph but throttle was to jerky. Alltrax field map was smooth but only got cart to 15 mph. I know it’s built more for pulling and not speed but 21 is a good all around speed for cart. Now my problem is I have no codes but I cannot get a signal to return back to controller from ITS. Have 10.43 volts on white wire and black wire which Alltrax said is within range. However when you press pedal I have no drop on white wire which lead tech from Alltrax to think ITS was bad. I had 4 new ITS on shelf and put everyone in it and still same results. I’m lost. What else can I check to rule out ITS before I send controller back to have checked out?? Thank you for your help and input.