Quoted from Dan_Halen:LTG suggested this somewhere and I've been on the lookout for a loose harness ever since!
I bought several harnesses on Ebay back when stuff was cheap. And then a pinballer cleaning out his garage gave me a bushel basket full of wire. So I have all kinds and colors of wire---most of the time. The challenge is finding the long wire you need in the colors you need. There are lots of short wires to plunder.
But I am getting ready to go this way for some of what I need.
https://pinside.com/pinball/forum/topic/there-s-one-more-scared-stiff
See post #36. Then move to posts # 59-#62.
I bought a collection of wire with all of the colors needed from Amazon. This is 1000 feet of wire for $58.00, or $5.80 per roll, or 6 cents per foot (Amazon's math is not correct ).
https://www.amazon.com/gp/product/B07QFXQX7W/ref=ppx_yo_dt_b_asin_title_o09_s01
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I will be buying the Uni-paint pens in the next few weeks. And I will have to make the paint pen holding tool.
https://www.amazon.com/Sanford-63721-Uni-Paint-Marker-Assorted/dp/B00N56N9ZY/ref=sr_1_7
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This is not a cost effective solution if you need just one or two wires. But I will be able to make any wire/stripe color combo I need. In any length I need. red wire/black stripe, yellow wire-orange stripe. ect.