fordtrucker4life!
I work with waste
I'm talking about the unit the dealer puts in and plugs into the OB2 port I've seen some dealers need new ones because they got broken or they have only one to put on and they could have it on someone elses truck but I'll get to the other point my trucks in the Fleet needed harnesses and there was no chaffing I think ford had manufacturing problems as to who ever made the harnesses had screwed up because one of mine had injector harness issues after it was on the road for only one month with 1000 miles on it and there was no physical signs of a harness problem at all the shop mechanic got tired of messing with it he even changed the EGR because he thuoght it could be an every so often deal and might not be throwing a code.
Most of the wiring in my E-series is made in Honduras, it says it at least twice on every harness, so the quality might not be as good as you wish.