Jeff........I'm a certified missile and aircraft wiring harness maker and installer. I can NOT make a wiring harness as cheap as I can buy one. Unless yer a sphincterly challenged originality inspector rebuilding a trailer queen, DO NOT mucka'round with cloth covered rubber insulated "original" harness. Modern vinyl is so much better.
When I replaced the original harness on my 52-8N, my 10-yo son did the screwdriver work. (part of a Boy Scout merit badge reqmt) the harness wires were of the correct length, terminals the correct size, and color code matched the FO-4 manual. Piece'o'cake.
Iff'n yer new harness is NOT COLOR coded (and surprizingly enuff, electrons don't care what color the insulation is) use of an ohm-meter as an end-to-end continuity checker before installation is a wize thing to do.
Didja know the wiring harness's used on BOEING aircraft are ALL WHITE and have "printed" wire numbers on them for circuit identification. All flight test wiring is ORANGE for removal after airplane testing .......Dell, retired Boeing Flt Test Engr