How to split one wire into two (the easiest way) - YouTube
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Ignoring the bad wiring job, was using a splitter box to split the wire from my battery into two wires for my sub-amp and speaker-amp, an acceptable means of powering both amps? :
electrical - Wiring a Junction Box: 1 source in, 2 sources out - Home Improvement Stack Exchange
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Properly "Splitting" Wires | Bob Is The Oil Guy
electrical - Can I use four-wire cable from the panel to create a two-circuit duplex outlet? - Home Improvement Stack Exchange
How to Connect 4 Wire & 3 Wire at the Junction Box | ehow
What is the technical term for the two wire cable that is used in 2 prong, 3 outlet extension cords, fans, and small household electronics? - Quora