Quote:
Originally Posted by spock505
My thoughts on this after speaking with other MB owners, well one anyway.
Cars fitted with OM606 engines have similar parasitic draw regardless of spec, however those with higher specs have higher rated batteries which helps overcome this issue.
Example, a/c fitment requires additional fans which tend to run after vehicle shut down.
I can't remember the exact figures but my 210 with a/c factory spec 120mah battery, v E300 no a/c 80mah.
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Batteries are rated in AH, not MAH. A typical battery for a 201, 123 or 124 Diesel will have a 70AH capacity, enough to last 145 days @20 ma (actually, longer, due the the Peukert effect.) Sometimes batteries are rated in hours of reserve capacity, measured with a 25 amp load. So a similar battery might be rated at 120 reserve minutes. That works out to more than 100 days @20ma, but will actually be much longer due to Peukert's effect. So you have 3-5 months before this draw becomes a problem. Most of these small losses are going to be leakage through the alternator diodes. If you're really worried, replace the alternator. Just be warned that even brand new diodes will have some leakage. Better to find something else to worry about.