[woodcote]

Keith - it's a very specific process to bind a throttle to the powerbase, which can be found on pages 8 & 9 of the ARC Pro Quick Start Guide...

   

• Insert AA batteries and check controller powers on - red LED on controller will light up
  
• Turn off controller
  

• Press and hold binding button on powerbase for colour you wish to connect to
  
• Corresponding LED will flash green to indicate binding mode
  

   

• Fully depress and hold trigger
  
• Continue holding trigger and turn the controller on
  
• Release the trigger - your controller should now be connected
  

That's the same process for connecting a new controller or moving an existing controller to another colour. So if the other two connect to yellow successfully, the new controller is probably faulty.

Don't forget that if you move a controller, then you need to get controller, car and app set up on the same colour: https://slotracer.online/arc-pro-guide/preparation.php