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If its not the battery deciding its had enough of its life, get the w203 to an auto electrician, almost guarantee you'll have a bad charging/alternator/starter motor cable, its one cable with a junction in the middle (for a block heater on diesels, not sure if the v8 needs one!) and they rot. One of the reasons my little diesel one ended up with me is rampant charging & starting issues that the PO had been chasing for so long (think car has had FOUR starter motors in 3 years) that he finally gave up.
No idea how much the cable is from merc, imagine around £70 to £120, I just made a piggyback cable up from some recycled very high quality process machine cabinet, starts and charges like a boss now. Still has an intermittent medium level drain, not the seat modules, suspect something to do with alarm/coming home lights/interior dome lights or something that has its fingers on all of above.
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BrickMan
@Dammit
Two hour drive home, stopped at the petrol station to fuel up for tomorrow (leaving at 4am for the airport). All the pumps busy so pulled up on the "wrong" side. Hose wouldn't reach, moved car - cranked over very lazily, odd. Hose would now reach, but the nozzle angle wouldn't go in. Balls. Jumped back in car - barely cranked. Now alarming.
Drove to a different petrol station - filled up with no drama. Turned key - long pause. Finally spins and catches. Not a good omen for 4am when the car is stone cold.
It's on charge now, and the amber light has turned green. I pulled the cover off and this is what I found - note the original Mercedes part number:
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