Jmoure

Hello everyone. I have a 2017 SL450 that showed no issues when I parked it a few days ago with the top down in the garage. This morning, the car was completely dead. No lights, no horn no dash lights nothing at all. How do I go about fixing this if I can't open the trunk and if I could, the top is down so how can I get to the battery? I've only had the car about 6 months so I'm still fairly new to the SL and its inner workings. Thanks in advance.

Jmoure

I tried jumping it off with my wifes car but the batter was too dead. I did at least get all the dash light to come on and it attempted a "weak" start. Is it safe to connect a battery charger to the jump posts under the hood?

Montreal300

It's ok to charge from the posts under the hood.

crconsulting

These cars tend to be pretty hard on batteries, and typically can fail without the "normal" warning signs some cars will exhibit when a battery is getting old.
You can only determine the true condition of these batteries under testing. BTW if you're not aware, there are two batteries in these cars. While the auxiliary battery will typically flash a message on the dashboard. The main batteries will not and should be replaced somewhat regularly.

The best place to jump these cars is under the hood. You can also try to put an AGM comparable charger on it overnight too. But chances are the battery may be too run down....

Good Luck

Jmoure

Thank you for the response. If I am unable to recharge the battery do you know if the top can be manually raised to gain access to the battery?

crconsulting

Here's the procedure for raising the top manually:

Jmoure

Thank you! How important do you think it is have those prop tools? I don't have those Do you think I could use something else?

crconsulting

Yeah, you're going to have to get creative but you're going to want to have something to prop that roof up.
I usually make custom props like that out of wood. As long as there's not too munch weight on them!

Jmoure

Thanks for all the input! I/m more confident in my ability to change the battery now!

crconsulting

As long as you can access it, you should be smooth sailing. Just be careful not to arc/short those terminals. Make sure you get a comparable battery. If you have any doubts, just get one from MB. It will probably last the longest anyways.


Here's a good thread to read:
https://mbworld.org/forums/sl-class-...ent-guide.html


Good Luck!

Jmoure

Thanks again for the help, it was very useful. I was able to get access and put in a new battery and now my baby is back in action.

crconsulting

Always like a story with a happy ending 👍
Good Job!