Otto,

I recently acquired a 240D too, so I know where you're at right now. The first thing I would do (and one of the first things I did do) would be to replace all of the fuses. Mine had the plastic body fuses which should really be replaced with the ceramic body type. Even if the fuses look fine they can be bad or going bad. The ends thate contact the terminals also get corroded creating resistance. That may not be your problem, but I would start there before proceeding with anything else - new fuses and clean the terminals if they look even slightly corroded. Good luck.

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'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
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"Back off, man. I’m a scientist” ~ Peter Venkman