The very first thing I would do is pul all the fuses and give them a good cleaning with either fine sandpaper, a fine wire brush, etc and reinstall them to be sure that they are all good and making proper contact. Often a MB fuse will look good but not be making actual contact from corrosion etc. Do it to make sure. Then go from there. many people have chased gremlins only to find a fuse was the issue. Check them all with a meter before reinstalling them to make sure they are good also. Good luck

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red