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my personal preference is threading back each wire 3/4" and twisting the junction straight into one another, use flux on the joint then heat it with a pencil torch and solder the connection. let it cool off then shrink wrap it with quality shrink wrap.
stock mazda wiring harnesses use sealant tape and crimp connectors, which eventually fail quite regularly in the eastern states causing many very difficult to trace intermittent electrical issues.
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