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 Dan Your Own Question
Dan
Dan, ASE Certified Technician
Category: Mercedes
Satisfied Customers: 1695
Experience:  Auto Technician
94707146
Type Your Mercedes Question Here...
Dan is online now
A new question is answered every 9 seconds

Battery was dead. I charged it fully but the car won't

Customer Question

Battery was dead. I charged it fully but the car won't start. No lights are on
JA: Did you test the battery with a voltmeter? And have you ever changed one before?
Customer: I have a battery charger that indicates its fully charged
JA: What is the model/year of your Mercedes?
Customer: 2009 ML350
JA: Are you fixing your ML350 yourself? What have you tried so far?
Customer: For now just bought the battery charger and charged it
JA: Anything else you want the mechanic to know before I connect you?
Customer: I suspect the battery was drained through the USB lighter adapter that was left in the car overnight. Also I just bought this car a week ago.
Submitted: 1 year ago.
Category: Mercedes
Expert:  Dan replied 1 year ago.

Hello my name is***** am an ASE Master Technician and I am glad to help you out with your question.

Expert:  Dan replied 1 year ago.

Check the main fuse under the right front seat.

Expert:  Dan replied 1 year ago.

Here is a diagram of the power distribution.

Expert:  Dan replied 1 year ago.

Please reply to this if you need more help and we can continue this conversation at no extra charge. This does not have to be my only answer. If you are satisfied with my service, please rate at the top of the screen. Rating does not close out your question. Remember, sometimes it is difficult to completely diagnose your vehicle without being there, but I will try to give you the best answer I can. Hoping to be giving you 5 star service.

Thanks

Customer: replied 1 year ago.
Hi Dan
Expert:  Dan replied 1 year ago.

Let me know what you think and if you need more help please reply.

Customer: replied 1 year ago.
with the main fuse - what can I do if I find it?
Expert:  Dan replied 1 year ago.

See if it is blown, if it is replace it.

Customer: replied 1 year ago.
OK the main fuse is located under the passenger front seat. How would I know that it has blown?
Is that something generic I can obtain or it needs to be a special Mercedes fuse?
Expert:  Dan replied 1 year ago.

You can look at it and see through the window if is it blown. You should be able to get one at any auto parts store.

Customer: replied 1 year ago.
Is that a common problem when you drain/charge battery?
Expert:  Dan replied 1 year ago.

Its common if you charge the battery and still have no power to anything in the vehicle.

Customer: replied 1 year ago.
OK, just looking for this on the net. It shows that the fuse box is located under the hood? is that different than the one under the passenger seat?
Customer: replied 1 year ago.
See attached
Expert:  Dan replied 1 year ago.

My service manual wiring diagram show it under the seat.

Customer: replied 1 year ago.
Also, which fuse (based on the diagram) could be responsible for engine start failure?
Expert:  Dan replied 1 year ago.

The starter fuse is under the hood, here is another diagram.

Customer: replied 1 year ago.
Thanks. So its either fuse 105 or fuse 122
Expert:  Dan replied 1 year ago.

Your welcome.

Customer: replied 1 year ago.
Unfortunately looks like all fuses are fine
Expert:  Dan replied 1 year ago.

Have you tried to jump start it?

Customer: replied 1 year ago.
No - I haven't. Thought charging would be safer
Expert:  Dan replied 1 year ago.

I would try to jump start and see if it will start.

Expert:  Dan replied 1 year ago.

Hello again Dan here,

I am contacting you because the post has not been closed or rated.

This question is coming up on 7 days which means it will time out and close.

You have already paid to get this question answered, but you have not rated.

Let me help some more. Is there anything else I can help you with?

If I did not give you 5 star service, please let me know what I missed.

Thanks