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Im an overkill kind of guy too,but 6 gauge is too much to feed your block with. You won't be pulling enough amps to justify that with. I would run 8 gauge at the most. As far as the lights, I would bump that up to 16 gauge not 18. I believe 16 is stock. They won't need more amps than that anyway on that short of a run. for your 12 volt cigarette lighter, I went overboard and used 10 gauge. It is also a short run from mine to the block. In case you plug in anything more demanding, I would use anywhere from 10-12 for that. Good luck and post some pics!