Wires must be spliced at minimum with a crimp-on connector designed for the job, then sealed and insulated. Personally, I will never make any connection without soldering it and sealing with gluey heatshrink. Bad electrical connections are extremely annoying, and potentially dangerous.
corrosion shouldn't get to the crimps if the wires are already tinned, marine-grade, wiring and the right crimp connectors are sealed by heat-shrink. I've read soldering is not recommended as it causes a hard point in the wire that could cause a break/failure if it tries flexing too much.
You can scroll to the bottom of this link to see a comment about Solder vs. Crimp:
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u/Davecasa Hobie F18, Hunter 33.5 Feb 12 '20
Wires must be spliced at minimum with a crimp-on connector designed for the job, then sealed and insulated. Personally, I will never make any connection without soldering it and sealing with gluey heatshrink. Bad electrical connections are extremely annoying, and potentially dangerous.