This seems to be my day for saying this, but first I would go around checking all of your plugs, unplugging them and replugging them (always remembering to line up the arrows). If that doesn't work, at the base near your crank, on the opposite side of your chainring there is a trapezoidal door, that is where your controller sits. It may also have two screws underneath holding it in. You can take off that door and check those plugs too, especially the battery plug. Next, because you have the same bike, you could unplug your display and move it to your wife's bike to see if that fixes things. (You can see where I am going with this). You can also switch out the controllers, if you want to test it that way too. In regards to getting a new controller, the controller and the display have to match. Not only that, but the controller has been set up and pre-designed for Velotric. Unless you want a DIY project of installing your own controller and display, one that is programmable, you are going to have to order one from Velotric. They should know that information and it should also be written on the controller. If these are new bikes, you can ignore all of this and take it to a Velotric bike shop in Indiana and have them sort it out. I have the Velotric small cargo bike and it has been a dependable little work horse. So, you should be able to get all of this worked
out. Let me know if you have anymore thoughts or questions.
