I don't know what type of vehicle, model or year, but it sounds like a blown fusible link. This is not a fuse, but acts like one. They are generally wired in at the starter after the positive cable connection (again I don't know what vehicle). Sometimes they are wired directly off the battery at the positive cable. On the trucks they can be at the firewall R/S relay center. Regardless, most fuse panels, alternators and cooling fans are controlled by a fusible link. By you jumpering the fuse boxes you are just taking place of the blown link. They are usually in-line (mostly large red positive wires. They can be a black bulge in the wire or just covered with black heat shrink. Follow all the leads from the battery and locate them. Test after the fusible link for power (use a test light if availible).
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