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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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