How to Change A Mercedes Starter Battery and Reset MBZ Battery Warning Light SL500 S550 CLS550

[@RANDOMFIX]

Link to 5 Amp Model amzn.to/2g1ay3W Less expensive 1.25 Amp charger amzn.to/2gmm473

[@kangmdphd]

Wow, thanks for the excellent advice. I just had a local auto parts store replaced a new starter battery for my SL500. The battery warning lights stay on as yours. I just disconnected the negative terminal of the consumer battery then reconnected it back. The warning lights disappear. It works as you said.

[@RANDOMFIX]

Glad to help and thank you for taking the time to post this great feedback about the Mercedes’ battery indicator.

[@daniellichowid8732]

I don`t know what else to do at my SL500-2006, my warning light won`t go away

[@daniellichowid8732]

@@RANDOMFIX Could be any other reason for this warning light to go on? I did everything like your video but my light still on..Thanks!!

[@RANDOMFIX]

Check the charging systems. Sorry as I don’t remember if mbz has a battery icon ( actual icon) that shows on instrument cluster right before you crank the engine when the ignition is on. But on most other makes it indicates a possible charging system issue as well. I hope that helps, keep me posted.

[@daniellichowid8732]

@@RANDOMFIX That could be the problem, the alternator🤦‍♂, I will try to check it tomorrow @ O`Reilly auto Parts, and I'm not sure if the actual battery icon pops on ignition . thank you for answering..keep you posted

[@josephking7021]

Thanks for the tip! I didn’t realize there was a sequence and your tip cleared up why the battery warning light and the ESP Light wouldn’t go away.

[@RANDOMFIX]

Glad to help

[@donharris1615]

I had the same problem with my 2007 S550, however battery test was saying the Mercedes battery was fine, but I would get a weak or no start eventually! So after researching I changed the starter battery with a $49 Walmart battery group size 26 w/540 cranking amps. It started up fast and powerful like new! I didn't disconnect the other battery in the truck, and everything is normal, no problems, so I didn't have to spend that $200 + for the Mercedes battery, just giving you all an option.

[@RANDOMFIX]

Don, Great information and thank you for sharing your experience with your Mercedes, this is what makes youtube so great. How long has it been since you changed it over to Walmart battery?_RandomFix

[@donharris1615]

@@RANDOMFIX a year and a few months, and still going strong!

[@donharris1615]

@rideordieguy rideordieguy I will try that with the old factory battery, thanks!

[@brianbui2460]

Will this battery work on a 2008 cl550

[@friendly787]

can wheely You probably don’t even own a car

[@Parksy-mx4tj]

Hello and thank you very much your video worked exactly like you said it would. I wish my local Mercedes dealership service dept would tell me the order to disconnect the batteries and when I asked them about winterizing the vehicle. All I was told was disconnecting the battery was a good idea and I didn’t think about there being a particular order to do that in so thank you very much!

[@RANDOMFIX]

I'm glad you found the Mercedes battery video helpful. Thank you so much for your great feedback.

[@Ockhamcool]

Read your owner's manual. Battery connect and disconnect sequence is included in the manual. Very specific instructions, sequence, etc.

[@eschnidr]

This video is great! Thank you so much. This info helped me to avoid going to the dealer and save me big bucks I'm sure.

[@RANDOMFIX]

I really appreciate the great feedback. _Randomfix

[@victornunez8322]

you are a good doctor just like you explained if I would have taken my mercedes sl 500 to a dealer it would have been at least $240.00 thank you

[@RANDOMFIX]

Sorry for the late reply, I appreciate your feedback

[@RegionalRadioShackManager]

I’m gonna try this. I bought an SL500 same issue. So also the key fob won’t work from a distance you have to get really close to unlock, the fuel gauge works sometimes but the little gas light does work even if the needle doesn’t. And my when I try to lower my top there’s no communication (nothing happens and I do the correct steps to lower it) so.... could the battery light be causing this??? I feel like the root of all these issues could likely come from one place. I appreciate your input bro

[@RANDOMFIX]

Sorry to hear your troubles. A bad ground or faulty battery could cause some of these issues. As for the remote, change fob battery battery, for the top, i would disconnect all batteries from the car, let all the sams ( signal acquisition modules ) go offline and try again. You can also purpose a obd2 tool like a mk808bt from autel that can access the Mercedes side of the vehicle so you can get a better idea what's going on. I have a review on the mk808bt. I hope that helps. _Randomfix.

[@harryhhu]

I have a opposite situation. Just replaced consumer battery and battery warning light is still on. Appreciate any help.

[@RANDOMFIX]

Thank you for the feedback!

[@julesviolin]

After disconnecting consumer battery on my SL55 I get an ESP unavailable message. This is perfectly normal and all that is required is to drive the car a few hundred feet to get all 4 wheels rotation info back into the Stability module so it can recalibrate itself. You will get the same error message if the consumer battery goes flat also. Nothing to worry about !!

[@fantasygodfathers]

Is there a way I can test my batteries at home? I’m not getting the red battery warning light but all of my car electronics are acting wonky and going randomly on and off? Ty

[@RANDOMFIX]

Yes, you need a real load tester, they are under $30 kzbin.info/www/bejne/mYeZf5ithbyiaKcsi=EzN5l1Nx_waQP9Gf

[@posseka]

I have that battery warning symbol that comes on before I start. The car has no problem starting. Are you saying that disconnecting the negative terminal on the consumer battery, waiting a minute and reconnecting it, then restarting the car will clear the battery error symbol on my dash?

[@RANDOMFIX]

Ak Essop, If you getting the battery warning sign on your dash like the one in the video the answer is yes. That's how I cleared my light, this will work for any Mercedes benz with a two battery setup. _RandomFix

[@munosh]

Excellent. Thanks

[@RANDOMFIX]

Glad to help.

[@miguelmartin2485]

Hi couldnt help boot notice your boot liner (rubber) i live in

[@RANDOMFIX]

Miguel, it came with the car.

[@gtagamer6987]

just wanted to thank u. i changed the small battery but didnt disconnect the the main battery in back so the rent battery light didn't go away. so after watching this i unpluged the rear battery and then the front and reconnected them back and now its good

[@RANDOMFIX]

Thanks for taking the time to let me that video helped. I really appreciate you leaving the great feedback. I recorded this video because this happened and I wanted to let everyone learn from my mistake. This is my I love ❤️ KZbin. _Randomfixn

[@daveloucks2293]

@@RANDOMFIX red battery is still on; I also replace 100 amp fuse in passenger floor area

[@RANDOMFIX]

Try disconnecting all power from both batteries and try again.

[@daveloucks2293]

@@RANDOMFIX ok did that starting with the negative on the trunk battery. Reconnected starting the starter battery. Red battery light still on...

[@RANDOMFIX]

Leave it off for at least 10 minutes. You may need a scantool with mbz support like this one if you have an more advanced issue. kzbin.info/www/bejne/bXe4fYqvnNt7odE

[@paulfilidei4890]

thanks..but I have one of the First built new Gen 2003 sl500..they came with 2 batteries from the get go..nice tip on video

[@RANDOMFIX]

Thank you for your feedback, much apprecated!

[@anon618]

What battery did u use in the trumk. Don't want to pay the high price for the merc battery. Thank u!

[@RANDOMFIX]

Get the merc battery a good agm battery, you will thank yourself for years to come. _Randomfix

[@anon618]

First thank you for the reply. Could you please give me the model # on the AGM battery for the trunk? thank you for the help!

[@caraleeweber6971]

Hi there! We swapped out the merc battery with a Duracell on my ‘04 e320 wagon and the darn thing has disabled convenience factors (no chargers or seat adjustments in passenger or book lights, etc). Any ideas about fixing this?

[@RANDOMFIX]

Caralee, Sorry for the late repsonse, did you ever get your E320 electrical issue sorted out? _Randomfix

[@brendanruffin9207]

I got a2009 s550 change the battery under hood now car won’t keep charge I had no problems before this can I get some advise please Thanks in advance

[@RANDOMFIX]

Where did you get the replacement battery and how long ago?

[@brendanruffin9207]

I got a battery from O Riley’s the issue happened three days ago I installed a day after the battery charge the car drove radio kept cutting off the next day the car completely cut off I gave it a jump to move car but after I move the car 30ft it cut off again thank you for response

[@RANDOMFIX]

Normally If a vehicle is running it doesn’t depend on the battery’s power instead the charging system. I would check the charging system like the alternator.

[@kentwhite6187]

My 2007 550SL consumer battery was changed. Car starts fine and checked the voltage before which was 12V and after starting 13.8V. The battery warning light stays on. I disconnected the negative terminal and waited for a bit and then reconnected. Warning light still on. Any fuses to check? Voltage regulator?

[@RANDOMFIX]

Kent, Start from scratch, disconnect the main / cosumer then disconnect the starter battery, wait an hour or longer if possible, reconnect the starter battery and lastly reconnect the consumer, let me know how it goes and best of luck. _Randomfix

[@RANDOMFIX]

It heads to leave the headlights on when you disconnect the batteries

[@AB-rr4xh]

How'd you fix it?

[@foreign_whip_Sam]

Great video, I will try this today

[@RANDOMFIX]

I appreciate your constructive comments, thank you for the feedback!

[@AaronsTalks]

Did I potentially blow the K57 fuse? :/

[@RANDOMFIX]

Sorry for the late reply, I appreciate your feedback did you get this handled?

[@Ockhamcool]

Changing the starter battery will not "reset" the red warning light in every case. Only when the starter battery itself is the problem will it reset. You can have a red battery warning light for a lot of reasons besides a bad starter battery. i.e. alternator voltage regulator failure, BCM failure, blown F52/1 fuse, etc. So, for those of you hoping that this will tell you how to fix the red warning light, be prepared for disappointment if your car is currently starting but you have the red light. Suspect BCM, voltage regulator or F52 fuse (under passenger footwell area...lots of fun to access, btw.

[@RANDOMFIX]

Thank you for sharing and you are right there is no one fix for all problems. Much appreciated

[@mikestanley91]

Very Informative!

[@RANDOMFIX]

Thank you for your feedback, much apprecated!

[@anon618]

thank you for posting

[@RANDOMFIX]

My pleasure 😊. _RandomFix

[@WeaponsEducation]

Can I just charge the starter battery?

[@RANDOMFIX]

yes.

[@samarakaur1625]

Will charging the starter battery help it start so I could at least get it to go get replaced?

[@RANDOMFIX]

Yes if it’s really battery keeping it from start.

[@mobshitallday7417]

Will a dead starter battery kill your trunk battery 🔋

[@RANDOMFIX]

Thank you for your feedback, much apprecated!

[@mrkongsimr]

What happens if you don’t disconnect , I didn’t and now I have a battery light . Thanks

[@RANDOMFIX]

Good question!! I would try disconnecting main the consumer battery( in the trunk ) and for a little while and then reconnect it and to see if that will clear your battery light on your dash. if that doesn't work then I would disconnect consumer battery again wait like 5 minutes ( trunk) and disconnect the starter battery under the hood 45 minutes reconnect a starter battery wait 5 minutes and reconnect the consumer battery and I should take care of your battery light. Best of luck and let me know how it goes.😃 _Ranfomfix

[@instigatoroffshoreracing2070]

What if the light doesn’t go off after disconnecting and reconnecting battery

[@RANDOMFIX]

Sorry for the late reply! did you find a solution?

[@joesmith9216]

flip it off, you can scroll through the menus, it will go off anyway though.

[@fritzs1207]

Switching off vehicle’s internal electrical functions: take off the start button and use the key : Shift the automatic transmission to P. Turn off all electrical consumers(radio /Nav) Turn SmartKey in starter switch to position 0. Turn SmartKey in starter switch to position 1. Wait for 30 seconds. The vehicle’s internal electrical functions are switched off. Turn SmartKey in starter switch to position0 !Do not remove the SmartKey!

[@RANDOMFIX]

Good info, Thank _Randomfix

[@Mercefreaken]

This is the correct procedure, as stated in the manual. It is not recommended to disconnect these cars completely from an electrical power source.

[@sihodaddy]

노란색 삼각형 경고등은 계속 뜨네요 어떻게 사라지게 하나요?

[@glhansenjr]

my red battery symbol still shows up, any ideas?

[@RANDOMFIX]

retry, make sure all power is really drawn down.

[@jabshooter604]

If my starter battery is dead what would happen

[@RANDOMFIX]

Clicking noise maybe heard from the starter solenoid

[@jmluke1876]

I think what fixed your battery light warning was replacing the stater battery.

[@RANDOMFIX]

thanks for the feedback

[@rajhkumaramalanathan5159]

Sadly, the battery warning light stays on, just tried... any ideas ?

[@RANDOMFIX]

Start from scratch, disconnect the main / cosumer then disconnect the starter battery, wait an hour or longer if possible, reconnect the starter battery and lastly reconnect the consumer, let me know how it goes and best of luck. _Randomfix

[@RANDOMFIX]

It heads to leave the headlights on when you disconnect the batteries

[@roberto.akerman49]

Depending on your S500(EU)/S550(US) year model you can have up to 3 batteries. W220: Combined Starter/Consumer (trunk right side), Auxilary battery (Driver side instrumentation panel, access from side). W221: - Up to -2007: Starter battery(engine bay passenger side), Consumer battery (trunk passenger back right side), Auxilary battery (Driver side instrumentation panel, access from side). - 2008-forward: Combined Starter/Consumer (engine bay passenger side), Auxilary battery (Driver side instrumentation panel, access from side). These type of cars with a lot of computers and/or advanced engine setups (read Porsche, Ferrari and so on) should not be left standing without trickle charge more than maximum 2 weeks. A low battery (not drained), can/will manifest in one or several control lights lighting up on your dashboard since computers are having issues reading and reporting values (make decisions). This can happen immediately on the ignition, after a while driving or when you floor it. A good solution is to add an onboard modern battery/trickle charger that controls the battery health. Connect the car every time you leave it for more than 4-5 days. Cars up to -2007 provide in my opinion a better setup since The CONSUMER battery is the one being drained, not the STARTER battery or Auxilary. And there are circuits in the charging system that protects the STARTER battery from being drained. Exactly the same way you would find on a boat or a recreational vehicle (house car) with multiple batteries. Cars 2008- or later have the combined Starter/Consumer battery. The Auxilary battery is a small battery that supports the electrical gear shift and some circuits in case car have empty batteries and need to be towed. No need to change or touch this and it does not drain the other batteries. Rare that it is faulty. Check the battery condition charging (alternator) capacity: - Check each battery with a Multimeter tool. Without any load, they should read above 12.7 which roughly translates to 80% capacity. Lower readings than 12.2 = You need to charge it. It is recommended to use a proper tool that also load the battery since you want to know things like 'Cold Crank Ampere' (CCA) - Start the engine and connect a Multimeter tool to each battery. The charging current should now read above 13.8V (preferably +14V) Battery Change: . Change separate STARTER battery: Just disconnect and change. Won't affect computers - Change separate CONSUMER battery: First, add a starter-helper or a separate battery (on the battery cords or via the ODB port (there are adapters)), so you do not experience a power loss. Because if you do, you need to reset all the settings and most likely have an ODB tool to reset computer warnings. - Change combined STARTER/CONSUMER battery: First, add a starter-helper or a separate battery (on the battery cords or via the ODB port (there are adapters)), so you do not experience a power loss. Because if you do, you need to reset all the settings and most likely have an ODB tool to reset computer warnings. Mercedes is not so helpful when it comes to battery, charging and multiple battery setups in their cars. They expect that since you own this expensive vehicle, you can afford to drop by their service and charge your car there. The handbook states everywhere "Visit Mercedes"... which for a secondhand car owner that bought the car for a fraction of the price, just becomes a tad bit ridiculous. If you own or thinking of becoming the owner of one of these high-performance cars, then please recognise that with great power also comes great responsibility...cost and high maintenance levels, not to be confused with a 'regular' car. :-) The S500/S550 has the same/similar engine performance as Porsche 911 Carrera or a Corvette, although it is disguised as a limousine.

[@RANDOMFIX]

Hi Rob, this is a lot great information. Thanks for sharing and I hope every one make good use of it. _Randomfix

[@Funkyswisscowboy]

U should never disconnect the consumer battery and when u change it it should be done with a back up battery. Otherwise u will loose all the programmed memory! Don’t do it and have the reset done by the dealership to get rid of the red battery warning light!

[@RANDOMFIX]

I appreciate your constructive comments, thank you for the feedback!

[@carlj7630]

My check engine light is on with that battery sign?

[@RANDOMFIX]

Carl, sorry for the delay, have tried my solution in the video? for the check engine light you have needa $20 obd2 reader to confirm the exact code. Let me know what you find, if you not sure, I have lots of videos on how to do this on a mercedes. Here is one kzbin.info/www/bejne/d5XWg5yvrZiHbbM BEST OF LUCK and let me know what you find. _Randomfix

[@Dardoorthopedics]

i have a CL 550 ...2010 with no battery in back ......

[@RANDOMFIX]

I appreciate your constructive comments, thank you for the feedback!

[@davidlease4130]

Did you notice the yellow triangular warning light?

[@RANDOMFIX]

David, Great question, Yes I just noticed the triangular yellow warning light in the video. It was illuminated due to low tire pressure (TPMS). _RandomFix

[@fritzs1207]

just changed the starter battery on 2007 s550 : No NEED for that : check the User Manuel there is a way to turn the on board Electronic system OFF .

[@RANDOMFIX]

thank you for the feedback!

[@maksymilianw5102]

Hello mate I has change my battery in sl R230 and I have this battery low indicates in red every time I starting a car.. how can I reset this ??

[@RANDOMFIX]

Sorry for the late reply! did you find a solution?