drcdj4

I have a 2001 Mercedes C320 and I'm experiencing some problems. The car will run good for about two weeks and then it looses power like if the battery is dead. At first I thought I had an old/bad battery so I replaced the battery and the car ran great for another two weeks and then it died again! After numerous batteries it still continues to do the same thing. It seems like the car just won't hold a charge. I have no idea what it is. I'm not leaving anything in the car on that would drain the battery. I'll just go to get into it and it won't start. I'm praying someone knows what the problem is. If so, is this a minor problem or a major problem? I MISS DRIVING MY BENZ! PLEASE HELP!

Holmes5518

Power seats? If so, unplug the module under the seat one at a time and see if the drain stops.

Glyn M Ruck

Other than the power seat modules not going to sleep & draining the battery the same applies to the HVAC sniffer fan in the overhead console.

otosan

Check your load when the car off, just use an Ampere clip or something like that,

Normal car wont give anything more than 0,5A load when sitting off doing nothing.

If its bigger than that, then better get all your electrical system checked.

Also, how about your alternator? Is it good? Check the voltage when idling,

Good alternator should give around 14V on the batt..