Käynnistysapua

Käynnistysapua, often translated as jump-starting or boost-starting, is a process used to start a vehicle with a dead or weak battery. It involves using jumper cables to connect the battery of a working vehicle to the battery of the vehicle with the depleted battery. This allows the working vehicle's battery to provide enough power to crank the engine of the stalled vehicle.

The process requires two vehicles, jumper cables, and a basic understanding of battery terminal connections. Safety is paramount, as improper connections can lead to sparks, damage to the electrical systems of both vehicles, or even battery explosions. Typically, the positive terminals of both batteries are connected first, followed by the negative terminal of the working vehicle's battery and then the negative terminal of the stalled vehicle's battery, often to an unpainted metal surface on the engine block.

Once connected, the engine of the working vehicle is started and allowed to run for a few minutes to charge the dead battery. Then, the engine of the stalled vehicle is attempted. If successful, the jumper cables are disconnected in the reverse order of connection to prevent sparks. If the stalled vehicle's engine starts, it is important to let it run for a significant period or drive it to allow the alternator to recharge the battery. If the battery continues to die shortly after, it may indicate a faulty battery or alternator that needs professional attention.