How can you find out what each fuse is for?

To find out what each fuse is for, consult the vehicle's owner manual or the fuse box cover, which typically includes a diagram or list of fuses and their corresponding functions. If the manual is unavailable, you can look up the information online based on your vehicle’s make and model. Additionally, using a multimeter to test the fuses can help identify any that are blown and may provide clues about their purpose based on the affected systems.