Yep soldering is the best electrical connection, but you can also use things called T-taps. Basicly, its a crimp on connector that you put over the wire, crimp the two halves shut, then use a male spade connector and plug into the t-tap. There are 3 basic colors used for different guage wire. I use them alot, and as long as you use the proper color, it will be a fine substitute for soldering. You can use butt- connectors, but i personally don't like cutting any wire in half that i don't have to...
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