ElectricScooterParts.com Support Center

When a controller runs the motor at full speed continuously that is usually caused by a burned out controller, however it could also be caused by a miswiring between the controller and throttle or by a faulty throttle.

I can check and see if the throttle is correctly wired to the controller if you could attach a photo of the connection.

If the throttle is correctly wired to the controller then the output to the throttle from the controller and the throttle signal can be tested by using the directions below.

Sorry to hear about that. I know expensive it can be when parts get burned out. When connecting parts to the controller the wiring needs to be done perfectly the first time or else the parts may get destroyed. I can see in the photo that the charger port red wire goes to the controller charging plug black wire, and visa versa. These kind of mistakes happen to the best of us though. I made the exact same type of mistake not too long ago with the battery wires and burned out an expensive controller.

You can do it yourself you just have to get in the habit of triple checking every connection and polarity, and then checking it again before you plug any of the parts together. Using a cheap multimeter before connecting part together to verify that red wires are positive and black wires are negative can help a lot to prevent burning out parts. Also the way that the wires are connected together is very important. It is to use either solder and heat shrink tubing, or automotive crimp butt connectors for every wire to wire connection, and to not use any tape in the wiring at all. Another important thing is to not leave any bare wires sticking out of a controller or other parts - bare wires should be attached to a plug, or terminated with a crimp cap so there is no chance of them touching each other.