Good post. One thing I see is your method of soldering can lead to a cold solder joint. The ends of the wires should also be tinned. You apply heat to the wire not the solder. You apply the solder to the wire, not the tip of the iron. Doing that is what leads to a cold solder joint. It will work for a while but as moisture gets up into it it will fail. Then try finding it.
The solder is drawn up into the wires via capillary action. Same as if you were soldering copper pipes.
Quote me as saying I was misquoted.
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