How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Mike Your Own Question

Mike
Mike, Mercedes Technician
Category: Mercedes
Satisfied Customers: 39198
Experience:  Tech Expert
9261905
Type Your Mercedes Question Here...
Mike is online now

HI-got an SLK 320 114kmiles-full service history 3 weeks age

Resolved Question:

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.
I was checking to see if you had already found your answer or if you still need assistance from one of the Professionals.
Please let me know if you wish to continue waiting or if you would like for us to close your question?
Thank you,
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.
However, should you wish to close your question and reverse your charges at any time please let me know.
Thank you for your patience,
Shantal
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
Mike and other Mercedes Specialists are ready to help you
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


What Customers are Saying:

 
 
 
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
< Previous | Next >
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex
 
 
 

Meet The Experts:

 
 
 
  • Matt

    Matt

    Mechanical Engineer

    Satisfied Customers:

    484
    BEng hons Mech engineering, in auto industry 22 years
< Previous | Next >
  • http://ww2.justanswer.com/uploads/35/350matt/2012-6-7_182356_matsavatr.64x64.jpg Matt's Avatar

    Matt

    Mechanical Engineer

    Satisfied Customers:

    484
    BEng hons Mech engineering, in auto industry 22 years
  • http://ww2.justanswer.com/uploads/EU/eurotec/2012-6-11_13153_mpjaphoto.64x64.JPG Marty's Avatar

    Marty

    ASE Certified Technician

    Satisfied Customers:

    21378
    Bosch Certified Master Technician with over 35 years experience in the automotive industry.
  • http://ww2.justanswer.com/uploads/MI/mikeamechanic/2013-4-2_175558_photo.64x64.JPG mike_a_mechanic's Avatar

    mike_a_mechanic

    Mercedes Mechanic

    Satisfied Customers:

    116
    17 years experience as a auto mechanic, foreign and domestic.5 years running my own repair business.
  • http://ww2.justanswer.com/uploads/MB/MBpaul/2013-8-21_204936_paul.64x64.jpg MB Paul's Avatar

    MB Paul

    Mercedes Technician

    Satisfied Customers:

    212
    Mercedes Benz Qualified Diagnostic Technician
  • http://ww2.justanswer.com/uploads/IN/indytech/2013-8-8_102717_SantoDomingo146598x6402.64x64.jpg Greg's Avatar

    Greg

    Technician

    Satisfied Customers:

    1081
    Automotive diagnostic tech
  • http://ww2.justanswer.com/uploads/TE/techmachine/0601821347169_717372168_8940977_39623330_o.64x64.jpg Ross's Avatar

    Ross

    Diagnostic and repair technician

    Satisfied Customers:

    453
    Licensed diagnostic and repair technician