I think what Jon says is true. The stock MB wires are excellent at least for there intended application.
I also have to question the burn through. Sometimes this happens in the field by poorly trained technicians. I cringe when I see a tech short a wire to ground using a test light poked through the insulation. It may be no problem when it leaves the shop but give it a few months for the elements heat and vibration to start working on that broken insulation and its all over.
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