Happy New Years everyone !!!
This is a GREAT thread and add 2¢....
Here is the best video showing the HOW2 properly solder two wires together
YouTube HOW2 solder two wires togetherDitto it, but change mine to RTV (a small amount goes a long way) and is water tight
Cold solder joints also has a higher impedance than a proper joint and has it 'porous' enough to wick in moisture/etc to rot the joint over time
If crimping, make sure the plastic barrel extends well past the joint and do NOT strip the wire insulation too far back. The crimp barrel MUST extend over the wire insulation. I use a heat shrink tube & RTV to further seal the barrel to wire insulation