you NEED to solder it and shrink wrap it.
go to you tube for vids, its real easy, radio shack has thin flux core solder,($3 ) put shrink wrap on the wire,(shrink wrap maybe $5) twist the wires together like you'll see on youtube, and heat the wires till solder flows over the bare wire, when it cools some, slide the shrink wrap over the splice, and heat the shrink wrap with a lighter or heat gun if you have one.
you now have a weather proof connection. blows them butt connectors to shame in the long run. they are weak and not weather tight.
