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 - Product Review - by Staff. When we finally checked out the 3000 PSI North Star, the whole story chaned. This unit was equipped with an 11 HP Honda engine with fuel shutoff, adjustable flow and optional syphon degreaser dispenser. It didn't have a pressure release or electric start to facilitate easy starting but according to the instructions, simply pulling on the trigger while cranking was sufficient. This method of starting proved more than adequate and kept the cost down on the unit. It had all the important
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