Red: 5V power Black: Ground Blue: Signal 2. Controller Protocol Mismatch Symptoms: No response even with correct wiring Solution: Check your controller settings and enable "Hall effect throttle" mode. If your controller only supports digital throttles, this product will not work. 3. Improper Installation Ensure the throttle is fully inserted into the 22mm standard handlebar Tighten the fixing screw evenly to avoid misalignment of the internal magnet and sensor Remove any interfering cables that may block throttle movement 4. Voltage Compatibility Issue This throttle supports 36V-72V systems, but requires a stable 5V reference voltage from the controller If you experience intermittent failure on 72V systems, check your controller's 5V output Quality Guarantee All throttles are tested before shipping. If you still have issues after following these steps, please contact us first for a replacement or refund. We will respond within 24 hours