Re: Weight and Waste?
"I think you need detailed engineering data to say that the one-size-fits-all design is heavier than the custom-installed design. Only the manufacturer has that."
Nah. A true custom harness is always lighter. Sometimes by well over 50%, even though it runs pretty much the same components (and sometimes more). Ask any hotrodder. Standard factory harnesses are notoriously far too heavy for the job.
And yes, they almost all contain many wires that don't do anything.