# Mercedes charging issue **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** mercedes-benz, s-class\ **Created:** [January 19, 2014, 9:46pm UTC](https://community.cartalk.com/t/mercedes-charging-issue/83243 "2014-01-19T21:46:26Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![cwlovescars](https://avatars.discourse-cdn.com/v4/letter/c/5f9b8f/32.png) [@cwlovescars](https://community.cartalk.com/u/cwlovescars)\ **Post date:** [January 19, 2014, 9:46pm UTC](https://community.cartalk.com/t/mercedes-charging-issue/83243/1 "2014-01-19T21:46:26Z")
Hello Car Talk Community, We have a 91 MBZ 500 SEL with 189K miles. Recently we replaced the battery, and still, the battery drains. We took out the alternator, had it tested, and it tested fine. Now we are wondering if the ground wire is the problem. Any ideas or similar problems out there? ---
**Author:** ![jesmed1](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/jesmed1/32/2097_2.png) [@jesmed1](https://community.cartalk.com/u/jesmed1)\ **Post date:** [January 19, 2014, 10:15pm UTC](https://community.cartalk.com/t/mercedes-charging-issue/83243/2 "2014-01-19T22:15:31Z")
The problem may not be charging, but a parasitic battery drain. Someone will have to do some detective work with a multimeter. Here’s how: > **[How to Stop Car Battery Drains](http://www.popularmechanics.com/cars/car-technology/a5859/how-to-stop-car-battery-drains/)** > > There are plenty of energy-robbing devices on your car that are supposed to go to sleep when it's parked, and sometimes, not all of them go to sleep. Here's how to give them a tranquilizer. ---
**Author:** ![cwlovescars](https://avatars.discourse-cdn.com/v4/letter/c/5f9b8f/32.png) [@cwlovescars](https://community.cartalk.com/u/cwlovescars)\ **Post date:** [January 19, 2014, 10:36pm UTC](https://community.cartalk.com/t/mercedes-charging-issue/83243/3 "2014-01-19T22:36:50Z")
Thanks Jesmed - will investigate.