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We have the same issues here on later harness's. Komatsu tells us the smaller wire has a higher tensile strength and needs to be smaller due to the amount of wire needed and of course cost. I say bull chit on the strength, so here is my simplified that makes sense to my simple non college edumacated mind. Because we are seeing areas in wires not chaffed or poked with a tool but have corrosion glorified areas under the insulation or totally open burnt areas in one wire on a multi wire run. I really think this so called special high tensile multi strand wire will have a single strand break or burn open due to possible stress under the insulation. Hence this little strand burns a hole in the insulation that cannot be seen with the eye. Of course when exposed to the elements and oxygen corrosion sets in and it fester's.The wiring issues we are having on the 2015ish and even worse on the 19 and newer trucks is ridiculous. I still think it's an issue in manufacturing the harnesses. It's never the same location, but it's always pierced insulation resulting in corrosion. And oftentimes in locations you know haven't seen the light of day since the harness was built.
Sorry for the lengthy explanation Ed but this has been a pet peeve of mine for many years. These failures as your well aware of can be very challenging to find. I've come to running a 24vdc bulb on circuits as times with a battery source just to see if the wire can carry the load.
Sorry mang, I've got a little out of hand on this. Better just eat my sandwich.