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18 gauge would be pretty wimpy for an electric vest. Even if it handled the current without overheating, and it might, it would be fragile. Nothing like a broken wire far from home of a freezing cold day.I would get the 12 for sure.
Wayne, I would vote for 18 gauge, 12 would be too stiff wouldn't it?I'm just going by the wires on my Girbing Vest, quite small.