Like large wire, small wire goes through various processing steps (feeding, cutting and stripping) before it is crimped. It’s imperative for harness manufacturers to make sure each step is performed properly so crimp quality isn’t compromised.

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You don’t need a fancy tool, crimps are very soft, you can use pliers.

Crimp-on connectors are attached by inserting the stripped end of a stranded wire into a portion of the connector, which is then mechanically deformed by compressing (crimping) it tightly around the wire. The crimping is usually accomplished with special crimping tool such as crimping pliers.

If not take the smaller wire and stip about twice as much as you need, make sure it is twisted and neat then fold it in half. Use a butt splice (crimp connector) and make sure the wire is fully inserted. Take the larger gauge wire and slip a piece of heat shrink over it first before crimping it in the butt splice.

When solder gets past the insulation, the wire loses flexibility. Just try bending a soldered wire splice to see it for yourself. If you install it on a vehicle, every vibration is like bending the wire a little bit.

Lifer. depends on how durable a connection you want. if going to take a lot of stress, solder it if not twisting it will be fine. and and best twisting connection is to form 2 loops with the loops going through each other and twisting the wires back on them selves.

Solder for a good electrical connection and to prevent the inside of the cable from corroding. Heat shrink to seal it to keep the outside from corroding.