I've used many different methods of wiring car stereos: bullet connectors, wire nuts, etc. and each has its own problems. I recently replaced an old radio and was looking for a better option that would hold the wires in place but didn't require soldering or shrinking. These posi-twist wire connectors are exactly what I was looking for, just twist the wires together and stick into the ground with a small wire sticking out from the top and screw the cap in place and you're done. They are nice and compact and hold the wires in place. I think it's great!
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