Hi Everybody,

I have a 93 300CE. My son bought a 2018 E400 coupe. It's interesting to see the two next to each other. Its A MB dealer STAR used car he got when a couple of year old. Car is spectacular but plagued with expensive problems. It's out of the extended warranty in a couple of months.

The newest is it now won't pass NYS inspection because the trunk mounted taillights are out. Dealer said harness is defective near trunk hinges. Dealer says if you wiggle harness the lights work so they cobbled something to get it working, but now won't pass inspection again.

Dealer says whole harness has to be replaced for $4500. Or there is a wire "healing solution" for $1100. I can't believe the the hatch harness on our 27 year old Jeep Cherokee works fine. Mercedes can't figure this out?

I'm pretty good at wiring and have wired a couple of complete cars, but I'm afraid to touch this. Can it be as simple as finding a frayed wire near the hinge, or am I going to get into some system controlled never ending nightmare? Or maybe the harness is pulling on a connection intermediately?
Bad ground?

Has anybody else run into this?

Would appreciate your thoughts.

Thanks!