Warning: If the car lights won’t turn off anymore because there is a fault in the circuit, then the light may continue to burn even when the fuse has been removed because the circuit is already closed before removal of the fuse. The light may become connected to this "irregular" circuit because of a fault or because of damage – and as this circuit is not connected to the switch, you logically cannot switch off the light. Improperly laid or damaged cablesĬable damage and a subsequent short circuit and / or improper routing of cables can create a closed circuit in the car that is not connected to relays, switches and fuses of the actual circuit. It is best to have this replaced in a workshop. Replacing a defective relay costs only a few euros. If the relay is broken, it can happen that you set the switch in your car to "Off" and the switch also passes on this signal, but the relay remains in the "On" position and therefore the light cannot be switched off. Broken relayĪ relay is a control unit in the electrical circuit that is responsible for closing circuits and thus, for example, switching on a light. This defect can usually be quickly detected by dismantling the switch. In such a case, you move the switch to "Off" – but the signal does not reach the light. One of the most common causes when a car light won’t turn off, is a faulty switch. In this case, you should not worry that your car lights will stay permanently on. If you buy a used car with an automatic light system, the lights will go on whenever you drive. Cars sold there often have an automatic light system that automatically switches on the low beam when the car is being driven. In some European countries, such as Scandinavia, driving with a low beam is also compulsory during the day. Finding out exactly which component it is often presents a difficult problem, even for experts. But in almost all cases it goes back to a defective part. If the exterior car lights won’t turn off, then there can be various causes for this. p> Exterior car lights won’t turn off: possible causes Nevertheless, if the lights won’t turn off inside your car this can still cause the battery to discharge overnight, especially if the car battery was not fully charged and if temperatures are also low at the same time. If the interior car lights won’t turn off, then this is much less of a burden on the battery than if the parking light can no longer be switched off. When these are left on, the battery can lose charge after just a few hours. High beam, fog lights and low beam consume the most power. The time it will take for the battery to discharge depends entirely on which lights are won’t turn off. This can also happen if the car parking lights won’t turn off anymore. You might find that the next day the car might not start because the battery has discharged overnight. Perhaps you have forgotten to switch off the lights on your car in the evening. However, you should nevertheless act quickly if your car lights won’t turn off because the battery can drain and the car might not start the next morning. There is often a simple explanation that can quickly solve the problem. The first thing to do is to keep your cool. When your car light suddenly just won't turn off, it can be nerve-wracking for many drivers.
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