Short answer: A wiring harness holds a lot of thin copper wire inside plastic insulation with connectors attached, so the copper yield is moderate and recovering it is fiddly, which means harnesses are worth selling in volume as insulated cable or as a separate wiring-harness grade rather than stripping them by hand, and a single car's harness is only a small amount.
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List Free →Many thin wires
The copper is in fine strands, which makes hand stripping slow.
Connectors and clips
Plastic and metal fittings reduce the clean copper share.
Sell in volume
Mechanics and dismantlers who collect many harnesses can sell them together at a worthwhile weight.
How ScrapTrade Fits In
ScrapTrade buyers quote on harnesses as their own grade, so you do not have to strip them.
Knowing your cable saves a lot of effort. ScrapTrade connects you with verified buyers, transparent weighing and escrow-protected payments.
List or Find Scrap on ScrapTrade →Practical answers on which types of cable carry real copper, which do not and how to identify each before you sell.