2000 CL500 Battery keeps going flat

[babyface]

I have a 2000 cl500, the battery keeps going flat, some times it is fine for 3 weeks, then it will go flat every day, I have replaced the battery twice using the correct type in bosh silver make. I have checked all systems with a modis and nothing comes up with any faults.

 

[horgantrevor]

their has to be a system drainig the system a trickle charge would do it

it could be anything from an alarm , radio , parking sensors ,

hope fully some one will be along soon to help more but i would disconect any items that are not a factory fit and go from their

 

[television]

The drivers seat module is a reason, and again it could be a SAM you either insert an ammeter in the circuit and with draw the fuses one by one or plug it into STAR

 

[Ellsy Tanners]

Check for any water under the drivers side rear seat, thats where the sam unit is and can cause a battery drain.
other than that it is as malcolm says, a drain check whilst removing fuses.

A draw of 0.04 amps or 40 milli amps is ok, anything like 0.1amps is too much and will flaten battery after a period of time.

 

[television]

Check for any water under the drivers side rear seat, thats where the sam unit is and can cause a battery drain.
other than that it is as malcolm says, a drain check whilst removing fuses.

A draw of 0.04 amps or 40 milli amps is ok, anything like 0.1amps is too much and will flaten battery after a period of time.

Yes spot on,, the last CL that saw. MB got it dwon to 42m/a and gve up. An S Class they got down to 48m/a.

The art is connecting up the ammeter so that the path of the leak is lost, do this by connecting another battery up first in parallel

 

[babyface]

Thank you

Thank you all for that info. I will give it a go and letyou know how I get on.

 

[David Nock]

Yes spot on,, the last CL that saw. MB got it dwon to 42m/a and gve up. An S Class they got down to 48m/a.

The art is connecting up the ammeter so that the path of the leak is lost, do this by connecting another battery up first in parallel

I think you meant to say 'path of the leak is not lost' Malcolm? I did a bit of head scratching until it clicked what you're saying - the leak shuts off and often won't replicate IF you completely disconnect the battery supply.