Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
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With the donor lamp assembly check and see if the bulb is o.k. in it for the dome lamps.If the bulb is burned out it will need replaced or swapped out with the bulb from your existing light assembly then re checked to see if the donor part works properly from there.If this is or was already attempted and the issue remains let me know so we can continue.
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But your dome assembly the bulbs were staying on all of the time am I correct?
And is this the front over head light console assembly you tried?
Looking at the info on this here the only thing I see is either a fault with the donor part that had an issue internally keeping it from coming on and yours as well is shorted being stuck on and you may need another good donor part or an issue with wiring to the dome light.But if wiring was the issue here then the donor light would have acted the same way and in this case it did not.I suspect the donor light has an issue internally as well and you need another light assembly to resolve this fault here.
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Does your model have the light switches near the door latch/striker area?It will look like a press in button that the door presses in on with the doors closed.If it does these are the switches that can fail or even push in needing replaced and will cause this here.If it does not let me know.