Alternators are inherently self-limiting for current. Even with the output terminal dead shorted to ground an alternator will not provide more than rated amps as stamped on the case.
And a #10 wire carrying 42 amps may get a bit warm but it won't melt/burn even with a 42 amp alternator at full load.
However your #10 wire COULD melt/burn should a short develop at the ammeter or wiring between the battery post and the ammeter. The battery could send several hundred amps thru the short which will quickly melt the wire.
Fortunately a short like this is not likely - but it is possible...
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Today's Featured Article - Talk of the Town: What's in Your Tractor's Toolbox? - by Staff. This recent discussion on the Tractor Talk discussion board here at the on-line magazine drew so much response and proved to be so interesting that we wanted to share it with you here. The names of the people participating in the discussion have been left out to "protect the innocent" (to quote a once-popular television series).
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