One area to investigate. Upon buying a new to you mercedes, change out all the old fuses under the hood with copper fuses. You can get them on ebay or your local imports store or buy them from this forum, which we like to support since they sponsor our forum. The original fuses are a silver kinda color and most are so corroded you cant tell if they are working or not. Best thing to do is change out ALL of them. I think BMW and VW used the same fuses, so if you can find an old vw parts seller they will more than likely be the same kind of fuse you need. Here is a link to our sponsor. Look up top under buy parts tab. Remeber to replace them one by one so you dont forget where they all go!!

PeachParts FastLane Mercedes Parts Store

Here is another link too!

MERCEDES BEST upgrade fuses 300SEL 3.5 4.5 6.3 280SEl | eBay

__________________