Turn on a circuit, like wipers, for instance, and start pulling fuses until it quits. It's very possible that you can eliminate, or consolidate circuits to free up some of those fuses for other purposes. Fuses protect wires, not the end item. If a heater blower motor shorts out, it's toast anyway. The fuse just prevents the wire from burning out when there's a heavy current draw or a short. An 18 gauge wire, for instance, needs about a 7.5 amp fuse, max. A 16 gauge wire can handle 10 amps or so, 15 amps for a 14 gauge, etc. Go with about a 20% to 50% overload capability for any circuit- - - - -If the accessory draws 10 amps, for instance, wire it with 14 ga., and use a 12-15 amp fuse.
Jerry