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as others are telling you, a few farads of cap is not a solution, the web is full of arguments about why not to bother, at best its a band aid for a poor electircal system, at worst its another load that you do not need.
As for wire gauge, you *could* get away with 20awg, since your lookinag at barely 1A along the line, however as you correctly note, you may suffer line loss over 15 feet (boot to console) with thin wires, 20AWG would lose about 0.4V over that distance, however using between 16 and 10AWG, that drops to just 0.1V across 15ft, and better than 10AWG the loss at 1A is negligible.
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