Hemmings take on wire splicing.

[corvette8n]

https://www.hemmings.com/stories/202...ign=2021-11-16

I used the rat tail before now I see a few more ways to splice a wire.

[glennpm]

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This failure of the soldered joints is something I've experienced and noted in this forum a few times.

"The inline nature of the last two splices not only contributes to their tensile strength, it also makes them less prone to vibration-induced wire failure, important in vehicle wiring. However, all four have a clear disadvantage if soldered, as the wire loses all flexibility at the joint. None of the splices provide for strain relief or secure the insulation, so you probably shouldn't rely indefinitely on any of these methods without some additional measures to prevent vibration-induced failure. That said, for quick get-me-home repairs, proof-of-concept harnesses, or places where vibration isn't an issue, either the Lineman's or J-Hook Splice should be sufficient."

I like the lineman's and then put two layers of shrink tubing over the top.

Thanks for the post!
Glenn