Technically, they are not "fuses," but "fusible links." Fusible links have been around for years; they used to be wires at the positive cable that would burn through if too much amperage passed to them on older Nissans and then they went to a plastic capsule with a window on top and were located in a fusible link box. Regardless of what type they are, on Nissans they are always at the positive battery cable connection or in a box close to the battery. Old GM cars used to run fusible link wires off of the positive post on the starter solenoid. Essentially, what you have been told is true. Each fusible link provides power (and circuit protection) to a number of fuses in the fuse block and each of those fuses provide power (and circuit protection) to one or more items. A large fusible link (typically 75A-100A) are used to provide circuit protection the the power feed at the back of the alternator. Unfortunately, I can't give you any more specific information as to what each fusible link at the battery cable end services without access to a power and ground wiring diagram for your specific vehicle. If you can locate a downloadable factory service manual online, go to the power and ground section and there should be a wiring diagram that shows those links and lists what circuits run off of them.
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