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Old 10-05-2012, 09:03 PM   #2
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Joined: Feb 2004
Location: The woods and mountains of Alabama
Oddometer: 8,330
When I make connections similar to those in your fuse block, I like to tin the wires rather than merely twisting them. It is likely over the years that some of the strands in your #12 red wire became isolated and no longer carried current. As such, fewer strands were sharing the load and overheated even though the circuit was not overloaded. I would tin each wire inserted into the fuse block.
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