your orange extension cords are multi stranded individual wires, usually 3 or 4 as opposed to one large strand in the 4 gauage, so not a good comparison, but the overall outer diameter is a bit thicker :CHEERS
I just done mine got it from 94 Taurus and just cut out yellow alt wire from harness on Taurus and I'm running underdrives and no issues have 14.5 at idle with them