"Not sure yet! I don't solder much. Most likely the connectors you slide the wire in from each side and then shrink wrap. Have had luck with that in the past."
The thing that I don't like about most butt connectors is they don't allow the wire strands to overlap at the joint and form a copper-to-copper contact. You could drill out the stop in the middle of the barrel to allow the wires to overlap but that's an extra step. Oh, the reason I asked about what type wire connector you're using is that by chance perhaps some member found a revolutionary connector.
This type were formerly available only to the aircraft/marine industry but now they're sold everywhere with varying degrees of quality. There are some available with a crimp feature but hard to find. I watched a youtube video where the author sliced the finished product in half and the low temperature solder didn't saturate the overlapping wire strands completely on 14g wires
here. Since the joint is also held together by adhesive, an inferior solder joint isn't holding the two wires together by itself. On, 18g wires, solder saturation was okay. The hot melt adhesive also provides a water proof seal in addition to the shrink tube.
