Why does the motorcycle not start and the relay makes noise?

[LaJuniper]

If the circuit breaker makes a beeping sound, the most likely cause is a depleted battery or corrosion on the battery terminals leading to excessive resistance. If the battery is ruled out, check whether the starter relay is faulty. You can directly connect the two terminal posts or the two thick wires of the starter relay. Another possibility is a fault in the starter motor, such as worn carbon brushes or commutators inside the motor, or excessive dirt—cleaning with fine sandpaper may help. The starter motor's coil could also be burnt out, requiring replacement. The electric start of a motorcycle consumes a significant amount of power, while the headlight and horn use much less, so normal operation of the lights and horn does not guarantee sufficient battery power for the electric start. Below is relevant information: Introduction: A relay (English name: relay) is an electrical control device that causes a predetermined step change in the controlled quantity in the electrical output circuit when the input quantity changes to meet specified requirements. It establishes an interactive relationship between the control system (also known as the input circuit) and the controlled system (also known as the output circuit). Typically used in automated control circuits, it functions as an 'automatic switch' that uses a small current to control a larger current. It plays roles such as automatic regulation, safety protection, and circuit switching in electrical circuits. Applications: Relays are automatic switching elements with isolation functions, widely used in remote control, telemetry, communication, automatic control, mechatronics, and power electronic equipment, making them one of the most important control components.