In most cases, the fuses in your BMW will not burn out unless there is some other underlying issue that cause them to break. A fuse is essentially a metallic connection point that carries electrical signals from one part of your car to a certain component. The fuses are set to break when a certain amperage is exceeded over that fuse.
For example, your BMWs car stereo system may rely on a 10 amp fuse. If there is a short in the speaker system, it could cause the amperage along that line to increase. If it increases and the fuse doesn’t blow, then the radio, the speakers, or some other component in your car could become damaged as a result.
If there is a short in the system, that 10 amp fuse should break and that will result in no power to the radio or any other component that is connected to that fuse.
It is important when you have a blown fuse to make sure that you replace it with the same exact rated fuse. If you place a 15 amp fuse in a ten amp fuse slot, it will certainly fit and the radio, in this example, will work. However, if the underlying cause of the fuse blowing out is not fixed, then more amperage will be allowed to cross over that electrical pathway and that can cause damage to the radio and other components.
If the radio gets damaged and the fuse doesn’t blow, then you’re going to have to invest in a brand new radio.
While this might not seem like a significant issue, when you begin talking about various components throughout the car, from the headlights to the seat motors, from the windshield wiper to the heating blower, repairing those components can become quite expensive.
It is a good idea to have at least one extra fuse on hand for each fuse type. For example, have a 10 amp, 15 amp, 20 amp, 25 amp, and 30 amp fuse stored in your glove compartment. In the event that you are out, away from home, and a fuse blows and you don’t have headlights or it causes some other issue with your car, you can replace the fuse to get home or bring your vehicle to a qualified and authorized BMW service center to diagnose the problem.