Q: Battery is drained in the morning - 2010 Mercedes-Benz C300
Battery is drained in the morning. It runs alright during the day after battery is charged but is usually dead in the morning requiring a jump.
My car has an automatic transmission.
Recommended Services
| Battery Replacement | $247.05 - $377.49 | Get a Quote |
| Car is not starting Inspection | $94.99 - $114.99 | Get a Quote |
Hello. You have either a faulty battery (a load test on battery can easily determine status of battery), faulty charging system, and/or a substantial phantom load (parasitic power draw) that is discharging the battery while the vehicle is turned off. Not to complicate things, but it is also possible that the battery is being drained while the car is operating due to other "phantom" loads that are not supposed to be there. I would start by load testing battery and evaluating its condition. If you need help with this, have a certified mechanic, like one from YourMechanic, diagnose the starting issue to let you know what needs to be done.
The statements expressed above are only for informational purposes and should be independently verified. Please see our
terms of service
for more details
Get an instant quote for your car
Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing
What others are asking
How do I adjust the brightness of the lighting on the instrument panel?
You may want to adjust the lighting on the instrument panel to make it less bright or to increase the brightness, depending on your personal preference. Locate the button for adjusting the brightness of the panel lighting, which is located...
How do I clean the sun roof seal?
If your power sun roof is having a hard time opening or closing, or is making strange noises while doing so, it’s a good idea to clean it. This will increase the health and life of your sun roof. To...
10% of the time, car won't start when rainy weather
Hello. The symptoms you are describing are commonly caused by ignition system problems with moisture. Old or worn ignition wires, or a cracked or leaky distributor cap, can cause the vehicle to experience hard starting. In wet weather, moisture can...
Engine cranks but won't start.
Hi there. There could have been a vapor lock in the fuel line, but also if fuel level is low, then the fuel pump will draw air when going up hill or starting and stopping fast. If the fuel pressure...
Car will turn over but not start.
Hi there. You will need to add a pint of fuel water vaporizer to the fuel tank. There is excessive water in the fuel system and that is why your exhaust is white is if there was water in the...
when i start my 2001 jeep Cherokee up, there is an electronic humming sound
Hello, thank you for writing in. Walking through the diagnostic process, we can rule out the wheels and suspension as a cause for the humming, as it happens as long as the car is running. The next step is attempting...
Engine code P0430 and losing oil
Diagnostic Trouble Code P0430 (https://www.yourmechanic.com/article/p0430-obd-ii-trouble-code-catalyst-system-efficiency-below-threshold-bank-2-by-spencer-clayton) means that the ECU is detecting below threshold performance from the catalytic converter. The ECU monitors the catalytic converter closely and when a low performance threshold is detected the Check Engine Light will be displayed...
Temp gauge goes up and down while driving 2006 Infiniti G35
Hi there - either the recent cooling system work did not thoroughly bleed all the air out of the system, or you still have a bad thermostat (https://www.yourmechanic.com/article/how-long-does-a-thermostat-last) - even the new one. A properly working thermostat should manage coolant...
Power loss 3000 to 4000 revs - Mazda3 2.0L sport 2005
Something like this sometimes stems from a sensor(s) falling out during the indicated range, that is the signal falling out. Such could involve the throttle position sensor, mass airflow sensor, or perhaps sensors involved in advancing ignition timing. EGR system...
Related articles
A Buyer's Guide to the 2012 Mercedes-Benz GL-Class
In In the world of full-size SUVs, Mercedes-Benz has made a name for themselves by offering unrivaled luxury in a field where the size of the engine is often the most important metric. While the 2012 Mercedes-Benz GL Class definitely...
How to Buy a Good Quality GPS
Even Even if you have a smart phone, there are still reasons to invest in a standalone global positioning system (GPS) navigator for your car. Once a destination is entered, the super easy turn-by-turn navigation allows you to see your...
How Long Should a Car Battery Last?
Eventually your car battery will become worn out and need to be replaced. Most car batteries should last about six years if well taken care of.
Browse other content
Cities
Services