I’ve only ever used butt splices and electrical tape/shrink wrap, which has worked OK. I hear that tinning, intertwining the wires, soldering them together and then putting shrink over the top is the more correct way, though.
Crimps are better than solder. When you solder a wire the molten solder wicks up the wire strands. A stress riser is formed where the solder ends. If the wire is not mechanically supported any vibration can cause the joint to fail. You never see solder connections on airplanes. A proper crimp tool and a favorite set of splices and compatible bullet connectors is a must have for the home wrencher. Honda uses a 3.9 mm bullet connector.
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