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Mike, Mercedes Technician
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Experience:  Tech Expert
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HI-got an SLK 320 114kmiles-full service history 3 weeks age

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HI-got an SLK 320 114kmiles-full service history 3 weeks age would not start- when you turned the key the fan would cut in and run for 30 seconds followed by a loud bleep -if this was tried for 4 0r 5 times the engine would start.
Just been with a 'Specialist'garage for the last 3 weeks who have admitted defeat. when it starts they have put an ammeter onto it and it shows 2.00 amps on tickover-they then watch it and after 10-15 minutes the ammeter suddenly shows 14-15 amps going in before returning (10 seconds later) to 2.0 amps-they have replaced the battery but cannot find what is causing this massive drain-which flattens the battery in a short time
Thanks
*****@******.***
Submitted: 2 years ago.
Category: Mercedes
Expert:  Shantal-Mod replied 2 years ago.
Hello,
I'm Shantal and I'm a moderator for this topic.
I've been working hard to find a Professional to assist you with your question, but sometimes finding the right Professional can take a little longer than expected.
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Shantal
Customer: replied 2 years ago.
Yes I still need an answer to the problem
Customer: replied 2 years ago.

I,ve not heard from anyone yet-how long does it normally take to get a reply

thanks

Expert:  Shantal-Mod replied 2 years ago.
Hello,
Thank you for getting back to me. Unfortunately I can not give you a time frame as we have a variety of Professionals online all the time. However we need to ensure that the right Professional is found to help you. We will continue to look for a Professional to assist you.
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Expert:  Mike replied 2 years ago.
Hello and Welcome..

My name is ***** ***** Im happy to help / advise...

Im sorry to see you have had a wait - I have been asked to help you with this..

Before we progress - can I just ask if you have had anything electrical fitted to the car etc prior to this happening?

Exactly what have the garage done - ie - what tests and on what have the tested ? What equipment has been used ? Do you have any fault codes for me ?

Please also give me the cars Full reg - and mileage -

Kind Rgds, MIKE....................................
Customer: replied 2 years ago.

Hello Mike

So far they have done a check on their computer which shows 'no fault' they have then doe a discharge test via a multi meter on the battery which shows a huge discharge which flattens the battery within 2 hours- if they leave the engine running it shows a charge of 2 amps and then if they leave it running after some 20 minutes the charge goes up to 15 amps for a short whilst before returning to 2 amp during this they have disconnect the cooling fan

hope this helps

thanks

Gary

Expert:  Mike replied 2 years ago.
Hi there Gary -

Thank you for your reply and info there..

I do just need to check Gary - these readings... are the for sure "amps".... amp readings ?

Too - Does the battery actually flatten?

Also - what else have they done then by way of tracing the fault down to a circuit / component?

Rgds - MIKE................................
Customer: replied 2 years ago.

Hi Mike

I will check with them on monday and get back to you- the reg No is 32 slk and the mileage is 114k- nothing has been fitted since I had the car -but the battery does flatten completely

Gary

Expert:  Mike replied 2 years ago.
Hi there Gary -

Thats fine no problem - just reply here as and when..
To save you time though, your symptoms meantime are that of either the alternator ( circuit ) or computer module intermittent failure.... basically. It can be another component or even a shorted wire on a circuit - but how to find this - as follows.

It needs to be checked for "charge rate" as well at the time when its showing the amp readings up high - switching over to volts to see whats happening there... just in case. But a big drain like that - while running as well, we would start with the alternator on drain test - by disconnecting it and see if the drain stops - if it does, you know that the alternator is the cause... ( They have diodes inside that should only pass current one way - if one or more fails they pass current both ways intermittently , hence you get your drain )

If its found not to be the alternator - then the way forward is to disconnect each circuit in turn -while the meter is on amps test - usually and at first anyway, via the fuses - and again - looking for the amp drain to stop - when a fuse is pulled... When it does, again you have found the circuit that the drain is on.. If its not found by fuse pulling, you then go on to disconnect a circuit at a time - computers / modules and so on until its found.
So thats the way to get to the bottom of this Gary..... and to be honest - while I know you have used a MB specialist - these jobs are usually best trusted to a good auto electrician... just a tip there.

Again by all means get back to me as above - but that is the way to get this sorted for you properly Gary...

Im very pleased to have helped you - Do let me know if you need anything more --

*** Meanwhile - - >>>> Please do click on the "OK/ Excellent ratings" for me - Thank you in advance for that...

You can and are most welcome to get back to me anytime you might need - clicking the OK ratings does not close you out at all..

Kind Rgds, MIKE.
Mike, Mercedes Technician
Category: Mercedes
Satisfied Customers: 39198
Experience: Tech Expert
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Customer: replied 2 years ago.
Hi Mike

I,m told that the problems seems to be with the immobiliser?I will let you konw the final verdict (when the cars running ,that is.thanks

Gary
Expert:  Mike replied 2 years ago.
You're very welcome Gary -

All the best... let me know if I can help..

Best Rgds, MIKE


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