While not a Mercedes I'm having problems with my GMC van's parasitic drain, which I can't find for the life of me. I see this item "Battery Brain" http://www.batterybrain.com disconnects the battery when voltage drops below 12V. It's a resettable switch, can handle high currents, and seems like a good idea for my need. Anyone ever try, or is using, one of these? Thanks.

I installed it on my car. I got the remote control version. Works great.

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Zafar
94 E320 58000 Miles

seems like a good tool. I've got a beemer that has the same exact problem of battery drain. I usually just unhook the positive cable when I leave it standing for more than a week.

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Whether you think you can or cannot, Either way you're right!. by Henry Ford.

I've had one of these on my infrequently driven street rod for about 5 years, never failed me yet. http://www.prioritystart.com/ BTW, if you google parasitic drain, or search here, there's lots of info on how to trace the fault down. My problem is in my alternator, and it will get repaired soon (yeah, right!)

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1986 560SL
2002 Toyota Camry
1993 Lexus

Hi there,
Keep in mind that every time the battery is totally disconnected from the ECM it will lose all the settings, so your van won't run right until you've driven it for 15-20 miles, because it will start off with the default settings. Same with the radio station settings. If you can wire the battery brain to bypass the ECM it should be ok to use.
Usually that sort of battery drain is due to the "keep alive" wire to the radio. Some radios draw as much as 70 ma when the vehicle is off.

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Richard Wooldridge
'01 ML320
'82 300D 4.3L V6/T700R4 conversion
'82 380SL, '86 560SL engine/trans. installed
'79 450SL, digital servo update
'75 280C

good point.
does the gadget that is mentioned earlier in the post, keep the settings for ecm intact ?

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Whether you think you can or cannot, Either way you're right!. by Henry Ford.