C220 CDI Coupe Battery Draining - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 11-28-2011, 02:38 PM Thread Starter
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C220 CDI Coupe Battery Draining

Hi Guys, I am new to the forum & the world of MB (well apart from an A Class my wife had a few years ago but we won't go there!) and need your knowledge already!

At the weekend I bought a 2002 C220 CDI Coupe auto with 82k on the clock and full dealer service history - nice car and being as I will be putting around 30k on a year I was after something nice but not too expensive and something that should be reliable, well I have to say today disappointed me.

I used it at the weekend without any bother and went out to a rather frosty morning today at about 6am and zero degrees. The car burst into life at the first turn of the key and I was on my way to my weekly visit to my office some 120 miles / 2 1/2 hour drive away. I arrived around 9.00 am and locked the car via the key fob & went into work. came out at 12.30 for lunch & couldn't open the doors due to the battery being so flat! I entered the car using the emergency key and all electrics were well dead. Tried jump starting off a friends Tiguan but nothing. I called the AA rescue guy who got it turned over after using his booster pack.

He ran all the usual tests and concluded the battery was holding charge & the alternator was working correctly but as soon as everything is switched off the battery is being drained by around 25 amps - easily enough to completey drain it in 2 hours.

I don't have electric seats or anything like that but the AA man thinks it maybe the engine block heater as that is allegedly a common fault on this unit? Trouble is he couldn't locate it to remove & see if it is the culprit.

Basically he couldn't help me further and left the car running telling me to get it booked into my garage for further investigation.

Can anyone help further - is this a common problem because if so I don't think I will be keeping my Mercedes and will go back to my Saab!

Any help is greatfully accepted as you can imagine I am slightly fed up with having the car for two days then being let down like this!
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post #2 of 2 (permalink) Old 11-28-2011, 04:56 PM
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Would 25 amp draw on parked car be normal, we would all ride bicycles.
That said, 25 amps need to generate quite serious heat or sparking. You should notice it quite easy.
Other way is to pull out fuses list and start pulling the fuses one by one while observing ammeter.
Welcome to the forum and good luck.
You do have fine vehicle, just fix the glitch.
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