Re: Wire butt connecters.
All the factory connectors are crimped on new vehicles and our 50 year old vehicles. Soldering has a potential for the conductor to break right where the solder ends if there is any vibration. Properly crimped connections will last a very long time. Adding the heat shrink adds a bit of strain relief.
40+ years electrician working in Nuclear, power plants, production facilities, and hospitals. Use whatever makes you happy.
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