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Definitely need to make sure the terminals are nickel plated high temp rated terminals and not ‘everyday general use’ with nylon insulation around the crimp and that all the connection points are thoroughly cleaned with emory cloth or another suitable abrasive.Â
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Is what the terminals should look like, a general use terminal will probably last 8 hrs or less at the temps expected. We normally take it to the next level, and pull the next wire gauge up sized high temp wire in the first time one burns up, seems to help although if originally wired with 12 ga, its a little tough to pull in 10’s but the heat reduction even if minimal does make a difference.Â