Originally Posted by def
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.
Like def, I tin the wires going into the Centech. Just before going on the Trail of Tears ride a few weeks ago, I was going over the machine with a torque wrench just checking things out. For some reason, I decided to check the screws on the Centech and almost all of them were loose after three years of riding around.