Charli411,
As I understand it, the 15 pin connector assembly block has begun to break apart on your ML. If this is the part you are talking about I can say that the same thing happened in my case too. After spending about an hour at the parts counter at the dealership near where I was working at the time, and working with a VERY helpful parts counter gentleman working the phones with MBUSA, he found the connector block part. I ordered one and it was perfect. The part number is 032 545 18 28. As I recall, it included the interior part where the 15 wire terminals plug in to the rear of the connector housing as well as the exterior "ramping shroud" which fits over it.

I will look for the tool I made to remove the wire terminals from the block one at a time and private message you with the photo.

That repair from January 2008 has been trouble free ever since.
Hope this helps you.
Ken

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2014 E250 Bluetec 4-Matic
2014 GL350 Bluetec 4-Matic
1996 Chevy Tahoe 4 x 4
2009 ML350 (sold)
2005 SLK350 (sold)
1999 E300 Turbodiesel (sold)
1998 ML320 (sold)
1991 300D 2.5 Turbodiesel (sold)