Fuses: Device used as electrical protection. It limits the electrical current that flows through a circuit.
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They can be identified with a number that states the maximum current they can withhold. Once this current is surpassed (due to an overload or a short-circuit), the fuse breaks down and interrupts the flow of the current. The location and function of each fuse is stated in the owner's manual of the car or in the plastic lid of the fuse box.
I have tried several combinations of USB adapters and cables to try and charge my iPhone with no luck. I have found that it works to charge other things and powers my dashcam no problem. I got round it by using it to charge a power bank and charge my iPhone off that!
I found 30amp fuse, in fuse box next to battery, with melted plastic which caused bad connection. This made several lights to fail and constant dashboard warnings. Cleaned connection and renewed fuse. All lights then working ok. Replaced couple of dark, but working bulbs, which removed warning lights on dash. Fuse labelled sb16 at top of box. 30amp. “On board power supply control unit battery , ABS, headlights and turn signals”
Hope this helps someone else.