Update: Got it done. I didn't end up breaking anything. For how BAD all the wiring was, the plastic routing shell was very flexible and I didn't break anything.

I think it goes to show you how BAD that insulation material really is.

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Regards,
Ian White

1995 E300 Diesel w124 OM606
2014 E550 w212 M278 biturbo

2001 BMW 740i E38 M62 (past)
1981 300SD w126 OM617 (past)