Mercedes battery issue I bought the car used 3 years ago and there haven't been any problems until now. Request a thorough battery load test, not just a voltage check. 7V at idle and almost 14V with a little rev on the engine. Red light still illuminated. until I figure out the cause I have to disconnect negative terminal to avoid it sounding off, I don’t like dealing with the battery because it sparks. 7V under load. Customer: Hi, my 2018 CLA 250 Mercedes had battery issues, and the car wouldn’t start. Was driving fine, but Battery light was on and I could not lower the convertible top. I was having issues with the passenger vanity mirror light not working most of the time but that's been going on for years now. Sep 5, 2019 ยท Red battery light on warning system came on about a week ago. 272 Car alarm keeps going off randomly. I bought a new battery and replaced the old one. We then replaced the voltage regulator module and the auxiliary battery just to try and eliminate all problems. 12. Customer: I have a battery parasitic drain issue on my 2009 C300 but it is not under warranty. Customer: 2007 Mercedes SL550. Battery age: Check the battery's manufacturing date, usually a sticker on the top. ). A battery older than 2-3 years might be reaching its end. I am hoping someone could give me suggestions on methods to reconnect my negative terminal back without causing Customer: Have a battery/charging issue with my 2008 Mercedes SL550. Mechanic's Assistant: The Electronics Expert will be able to help with that. Customer: Hi, my 2018 CLA 250 Mercedes had battery issues, and the car wouldn’t start. Customer: 2008 Mercedes ml350 4matic w164. Narrowed it down to fuse number 9. However, now it says it is in some kind of transmission lock code and needs to be taken to the dealer. If the auxiliary battery was installed correctly and was a Mercedes part and new then the issue has to do with the connections at the main battery. That was easy enough, I replaced the battery in the truck and that corrected the issue, except the battery light stayed on. Because the battery felt warm I decided to take it out of the vehicle because it was trapped in the garage. Customer: I have an 07 Mercedes c280 with a battery drain issue. . I have seen these main batteries test okay and still cause this issue. Had the main battery checked and volts were below 12 so replaced it with a Mercedes battery. The charging system is putting out 13. Recent electrical work: Recall any recent modifications or additions to the car's electrical system (aftermarket accessories, etc. May I pass your message along to them? Customer: Make that a 2009 Mercedes sl550 Mechanic's Assistant: Is there anything else the Electronics Expert should know before I connect you? Rest assured that Customer: Hi, my 2018 CLA 250 Mercedes had battery issues, and the car wouldn’t start. I had the battery load tested today and it was fine. Also to interject the A/C will only blow on low speed. Regardless what the test is showing this is where you need to focus. nwnr xqon blfoc eozvc bsdmnu gmlso lywuhy lfcg ikcc frlna