sir, I had the same problem with my 617.951, I unscrewed fuse box so I could see any damage, when raise up. I figured maybe too many glow start cycle's. I then cut out damaged section, and used a larger grade of wire. spliced, and soldered

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt