How to do a Basic Wire Splice

Everyone has there own way of doing things. Some have learned through experience what works good and what works better in their opinion. Then there are those who use the word best to describe their method. You can just about bet they will chime in here shortly. Anyway...
Weather sealing heat shrink tubing is available. Even stores like Lowes have it but its found on a different shelf, and cut into short pieces.
Shrink and seal terminals and connectors are available too. Those features do cost more.