The circuit protection needs to be sized to the wire. Usually that will be a 10 gauge, which can only safely handle 30 amps. But chances are the alternator can make more than 30 amps, so putting a fuse in that line will probably nuisance blow at some point. Fuses and breakers don't like being fully loaded for very long. Trying to use a simple inline cartridge or blade fuse is sure to soon fail.
If I were going to put any circuit protection, I would try to get some numbers off the alternator, see what it's output is, then match that number to the next bigger fuse link wire, install it where the wire is spliced.
Even though that will be beyond the useful capacity of the wire, it will protect it from a direct short should that ever happen.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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