Considering they will likely get wet, you may want to use insulated butt connectors with shrink tubing built in. They have a glue that melts when heated and seals everything up. Most auto parts stores have them.

Buy a good set of crimpers though. Channellock makes a nice set (~$20) as does Klein and a few others. Don't bother with the stamped metal ones you can get for cheap. They are garbage.

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