My car is a 2023 C300. A few days ago, the car wouldn’t start for about 6 hours. I tried jump-starting the battery, but it still didn’t work, so I just left it. After a few hours, I tried again and it started. Just in case, I made an appointment at the dealership today and dropped the car off.
On the passenger side, I have a 12V cigarette lighter adapter plugged in, and I connected my dash camera to it with a USB cable. But the dealership told me that I’m not supposed to use that port (?), or that they don’t recommend using it. They said if the issue is caused by that, the battery won’t be covered under warranty.
Does that even make sense? I mean, why would the 12V cigarette lighter port even be there if you’re not supposed to use it? Is it really true that using it can void the warranty?
Also, they said if they diagnose the car and determine that this caused the issue, they’ll charge me a $400 diagnostic fee. I'm like.... what..?