When i dont drive my car for more than 9 10 hours the batt dies what could it be? 02 mercedes c320

Question edited for clarity

See the videos

https://www.google.com/search?q=2004+Mercedes+Benz+C320.+open+the+hood+to+replace+a+broken+hood+release+cable

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The problem probable is a short to ground on one of ur circuits. when u drive at night u have ur headlights on which forces the alternator to produce more electricity. making it seem normal. or a defective alternator

Lead foot, tire pressures, stop /go driving. AC/poor compression, Trunk full of sandbags, transmission slipping, Wheel bearing friction, Brake shoe always on, etc.

That sounds reasonable to me.

Hi ddansvob-

Most of the codes for Mercedes C320's can be cleared (at least temporarily) by disconnecting the negative terminal of the battery and leaving it disconnected for at least 1 minute. I would give it several minutes just to be sure.

There is also a reset procedure that you can use that involves disconnecting the battery, turning the ignition to position 1 several times and then reconnecting the battery. That procedure can be found with a google search.

Possibly the easiest way though is to visit an Autozone or other similar store that has an OBDII scanner that they will use for free on your car, and have them reset the codes. If there is an actual issue with a sensor, etc. though, the code will come back up after the car has been started a time or two. If that is the case, you are going to have to troubleshoot the actual cause of the code, involving finding a Mercedes shop that will help you with identifying what sensor(s) are causing that code to show up.

If your mechanic used non-OEM parts/battery, that is very likely to be the source of your problem. Assuming that they didn't do that (which would be unusual for any mechanic to do), you are likely looking at replacing a voltage sensor or part of the voltage regulating/distribution system. If you get to that, you are REALLY going to need an experienced Mercedes mechanic.

Good luck!

the garage has to do it for you.

2001 MERCEDES-BENZ C320 - V6 3.2L 3199cc GAS FI N

Belt Routing Diagram Multiple Accessory


DAYCO Catalog

I hope help you with this (remember rated this help). Good luck.

if the car improve with the a/c off then check your radiator fan see if the fan comes on with the a/c on if not you might have bad fan

one of the problems could be , you have a bad drain on battery, check charging system,if you disconect battery and hook it back up does it ark if so check all elecrical components for drain

There is a fuse to protect the circut operating the electric steering lock.