Why does my Mercedes-Benz battery keep draining?

You try to start your Mercedes-Benz and the car is either completely dead or this happens: Battery drains happen when electronic equipment (consumer units) are constantly drawing current from the battery while the car is parked. One simple example is when lights are left on overnight. But it’s not always as simple as that.

Why is my GMC Sierra battery draining while driving?

If it is draining while your Sierra is off, it’s usually caused by something that is drawing current that shouldn’t be. If the battery is draining while you’re driving, that is probably going to be the alternator or battery. There are other situations as well.

How to find the cause of parasitic battery drain?

Luckily, you can usually find the cause of a parasitic draw yourself. Start by connecting a digital multimeter to the negative battery terminal of your vehicle. Then, remove the fuses one at a time while watching for changes in the multimeter’s reading.

Why does my OnStar battery drain so much?

Community Answer In older vehicles running analog Onstar, the system will drain the battery because it is constantly looking for a signal. Onstar no longer offers an analog signal, only digital.

How can I tell if my BMW battery is draining?

To test for parasitical drains, disconnect the negative post from the battery. Connect the (+) lead of an Amp meter to this ground wire and the (-) lead of the Amp meter to the battery terminal so that the meter is in series. Whatever the car is draining, you will see it in the meter.

When does a car battery start to drain?

If the battery drains when the vehicle sits for three or four days, that’s a lower amp draw than one that drains the battery overnight. Discovering the source of an electrical draw is a process of elimination. First, check the easy stuff.

Why does my car battery light keep coming on?

Replaced alternator and battery. When you start car battery light comes on then goes off, comes on again five minutes later, goes off again. If you drive more than twenty or thirty minutes battery light comes on and stays on.

When does the battery warning light go out?

The airbag computer will set a code and turn on the warning light when the system voltage is too high, or too low. The light should go out when the problem is repaired. It may not go out immediately though. You need to have your alternator checked. Right now, all of the electrical devices on your car are drawing from the battery.

Why does my Mercedes medic draw so much battery?

A radio receiver in the car continuously listens for wake up signal from the key. As the car receives a signal in the assigned frequency it wakes up to validate the key. This causes current draw for several seconds. If the car is left parked in high pedestrian traffic areas this could be a problem.

Why is my car battery not working properly?

Finally, a problem could be defective replacement parts. Sometimes, batteries are just not as good as they are manufactured to be due to hidden defects or a longer-than-usual shelf wait before being purchased. Similarly, alternators can be defective out of the box, especially if they’re refurbished or rebuilt.

What causes a battery light to come on after a battery change?

Persistent Battery Light After Battery or Alternator Replacement. There are usually two things that cause the battery light to come on after a battery replacement. The most common is a loose connection – perhaps a terminal connector was not tightened sufficiently when the battery was replaced.

What should I do if my car battery is draining?

Remove the key from the ignition and let the car sit for at least 15 minutes. In some models you may need to wait up to 30 minutes for all the electronic systems to go “to sleep”. This will allow the car to shut off any electronic consumers that stay on for a brief period after the car is parked.

What should fuse reading be on Mercedes medic?

The reading should ideally be under 0.05 ampere. Locate the fuse box in your car. Disconnect the fuses one at a time. As you remove each fuse you should check the amperage reading on the multimeter. If the multimeter reading is still high, reinstall the fuse and go to the next fuse.

What should current be on Mercedes medic battery?

Connect one test lead to the battery post and the other to the negative battery cable. You should see a current draw of less than 0.1 Ampere or 100 milliamps. If your read is over this value we need to do further troubleshooting. The reading should ideally be under 0.05 ampere. Locate the fuse box in your car. Disconnect the fuses one at a time.

How can I tell if my car battery is draining?

Make sure it is generating enough amperage. Check that the glove box light does not stay on when the car is parked. The easiest way to check this is to open the glove box after the car is parked for a couple of hours. Place your hand near the glove box light bulb and feel it if it is warm. Be careful not to burn your hand.

Why does my ATV battery keep draining while riding?

A bad or corroded connected connection will prevent the charging system from topping off the battery when you are riding and may even cause a small drain of the battery on its own. Simply removing any corrosion from the terminal or fastening any loose connections may be adequate to fix this issue.

Can a Mercedes Benz battery be replaced under warranty?

Upon investigation, the consumer battery was found to have failed but, as Mercedes-Benz of Santa Rosa had replaced it last summer, it was replaced under warranty (after MB of SR faxed the paperwork to MB of SF – apparently computer maintenance records not as “big brother” as we all hoped).

Where can I buy a Mercedes trunk battery?

The vendor is racerspartswholesale in Indiannapolis. Fast delivery, no problems at all. Excellent buy! It’s such a quality piece that it shuts itself off after fully charging and won’t turn back on until the battery drops below 95%.

How long does a Mercedes SL500 battery last?

My 2003 SL500 has 7,000 original miles so it sits for many months at a time. After charging the rear battery (which takes 12-14 hours because its charging both batteries), I’ve put the charger on the front battery and it lights right up saying completely charged.

When to replace battery in Mercedes medic medic?

Make sure you have a fully charged battery. If your battery is over 6 years old, you should consider replacing it to avoid further electrical nightmares. You can save on the cost of the battery by purchasing it online. For example, see this list of AGM Group 94 batteries for Mercedes-Benz on Amazon. Turn off the lights.

What should the battery voltage be on a Mercedes Benz?

Should be around 50 milliamps. You can also check charging voltage with the engine running and accessories on. Should be between 13 and 14 volts. I had a very similar problem with mine a few years back, the battery always seeming to go much faster than it should even when replaced.

What kind of battery does a Mercedes SL500 have?

216 with everything. 2002 SL500 with everything. 2009 SL500 with everything. You could have a fault in the reg pack on the alternator, just one diode with a reverse current leak will do this. they are cheap and easy to replace. An early 200 should pull no more than 35ma when locked.

Why does my Mercedes not start when I charge the battery?

This Mercedes-Benz is not starting because of a low battery. In this case, what you need to do is trickle charge your battery using any of these 12 volt battery trickle chargers. If you need help read this article on How to charge a Mercedes-Benz the right way. Mercedes won’t start, and it’s not the battery.

How old is the battery on a Mercedes Benz?

This may seem obvious, but an old battery is the root of many headaches and can cause all sorts of malfunctions on Mercedes-Benz cars. How old is the battery on your Mercedes-Benz? While some MB owners have pushed over 10 years on an original battery, the battery should be considered for replacement around 6 or 7 years.

Can you jump start a Mercedes Benz with a dead battery?

Note: Jump starting a car with a fully discharged battery will shorten the life of the battery or damage the battery. Hint: For a safer method to jump start a Mercedes-Benz with a fully discharged battery see Method 3. Method 2 Jump start your car battery with a booster pack / jump starter box.

What does it mean when your battery drains overnight?

Why the Battery Drains Overnight A slow battery drain when everything is off is called a parasitic power loss. This happens when something – a glovebox light, an amplifier, any electrical component – is pulling power from the battery when it shouldn’t.

What causes battery drain in Advance Auto Parts?

While you’re under the hood (or at Advance Auto Parts), test the alternator. A failed diode in the alternator creates a closed circuit that drains your battery even when the engine is off.

When to disconnect battery from parasitic drain?

If you’re too busy during the workweek and can’t get to it until you’re off, some short term fixes are to disconnect the battery at night, and carry a portable jump starter in your vehicle.

What causes a car battery to drain overnight?

This happens when something – a glovebox light, an amplifier, any electrical component – is pulling power from the battery when it shouldn’t. Since the alternator isn’t generating vehicle electricity, the problem component pulls from the battery, slowly draining it overnight until your vehicle won’t start.

Why is the battery draining on my Mercedes medic?

If the car is left parked in high pedestrian traffic areas this could be a problem. It may cause the battery to drain within a couple of days in some models. Try to turn off the proximity key function in your car by looking up the instructions on the owner’s manual.

How to get rid of negative battery drain?

Remove the negative battery cable from the negative battery terminal. Find the negative cable, which will be marked with a minus sign (-) and may have a black cover over it. Remove the cover, if applicable, and use a wrench to unbolt the negative cable from the terminal.

How to drain a battery on a GMC Truck?

With key off, unhook your positive battery terminal. Put one multimeter lead on the battery terminal and the other on the positive cable. You’re basically making the multimeter part of the circuit. Set the meter to read amps. Now, since its being drained I assume you’ll see some kind of amperage draw.

How can I tell if my Samsung S10 battery is draining fast?

Check Battery Usage. When your Samsung Galaxy S10 Battery life drains faster than usual, you can first check the Battery Usage. Here, you can check which apps consume too much power. Close or uninstall the misbehaving apps. To check Battery Usage, go to Settings > Device Care > Battery.

How can I Fix my Samsung Galaxy S10 battery?

Updating the Software can be the potential solution to fix Samsung Galaxy S10 battery issues. The update usually comes with the security patch and bug fixes that can improve the battery life as well. Check if there is a Software update for your device. Head to Settings > Software Update > Download and install.

Why does my Samsung Galaxy S10 battery last so long?

If you want the battery on your Galaxy S10 to last longer, you can make some simple adjustments. You won’t need to charge your phone every few hours. Here, we are going to show you how to fix Samsung Galaxy S10 battery life issues. If playback doesn’t begin shortly, try restarting your device.

Community Answer In older vehicles running analog Onstar, the system will drain the battery because it is constantly looking for a signal. Onstar no longer offers an analog signal, only digital.

What causes rubber hoses to crack on a Mercedes?

Rubber hose connections crack and work loose. And quite often some mechanic gets in there and messes things up. If you have a problem with your older Mercedes and are trying to figure what is causing it or how to fix it, you have come to the right place.

Are there any problems with the Mercedes engine?

Theses engines were more powerful and more fuel efficient. They did have a few teething problems but have proven to be very durable as long as they are treated and maintained properly. A true challenge – but you can do it with the right knowledge.

What kind of battery does a 2003 W211 have?

I’m equipped to do anything, so let’s see if we can get this one sorted – it’s my younger brother’s car…. a 2003 E320 (WDBUF65J53A150123) with a hair under 160k miles. Battery drains close to dead overnight, needs a quick jump and it’s fine for the day.

Can a car battery drain to dead overnight?

Battery drains close to dead overnight, needs a quick jump and it’s fine for the day. The car had a red battery warning on when it was initially purchased. Two brand new batteries were put in along with much newer and updated battery control module. Red warning hasn’t been back, all is well.

What causes battery to die on Mercedes medic?

A defective electrical system, Control Unit or a fault on the CAN Bus (Controller Area Network) are also causes that can cause your Mercedes-Battery battery to die. To troubleshoot the current draw, you need a multimeter that can perform current reading.

Can you replace the battery on a Mercedes-Benz W220?

This article provides instructions on how to replace the battery on 2000-2006 Mercedes-Benz S-Class W220 and CL-Class C215. Replacing the battery on your S-Class is easy, and you can complete this job in less than 30 minutes. No need to spend over $250 at a repair shop for a new battery when you can replace it yourself.

Where can I get a new battery for my Mercedes’s class?

No need to spend over $250 at a repair shop for a new battery when you can replace it yourself. We have even included links where you can find a replacement battery for your S-Class at a much lower price than the dealer or your local auto parts store. Keep in mind that you need to get a Group 94 AGM Battery for your Mercedes-Benz.

How much does it cost to replace a Mercedes S350 battery?

Mercedes-Benz S350 Car Battery Replacement at your home or office. Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing. Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM. Mercedes-Benz S350 Car Battery Replacement costs $336 on average.

I drive the car all day, and it’s at 800 by end of day (so the alt is charging the battery). For giggles, took in to advanced to have them test the charge system and they verified the battery and alternator are good. Battery BTW is only 1 month old. But, every morning, the car is completely dead and needs jump started.

What happens if battery goes bad on SL500?

Costco are pretty good in researching what they sell BTW. All lead acid batteries of whatever construction last MAX 5 years. Be warned a battery going faulty on the SL500 usually causes an alternator failure which in turn blows a SAM. Yes, exactly. Leave them both hooked up and in the car. It charges the rear and front batteries at the same time!

What kind of battery charger do I need for my 2003 SL?

I picked up a CTEK 3300 for my 2003 SL and hooked it up today. I installed the set of battery cables that connect directly to the battery terminals. Very convenient when I want to disconnect and go. I just draped the cable out the back of the trunk lid to the right with the charger itself outside on the floor of the garage.

Is there a problem with the battery in the trunk?

I have a 2004 SL500, owned it since February 2007. As many know, the consumer battery in the trunk has a problem of staying charged up after the car sits for a few days. I had this problem, and after much research, decided to buy a CTEK 7002 charger, since it was much cheaper than a new battery.

What does it mean when battery drain is slow?

A slow battery drain when everything is off is called a parasitic power loss. This happens when something – a glovebox light, an amplifier, any electrical component – is pulling power from the battery when it shouldn’t.

While you’re under the hood (or at Advance Auto Parts), test the alternator. A failed diode in the alternator creates a closed circuit that drains your battery even when the engine is off.

Why do my park lights stay on after I Turn Off the motor?

My park lights stay on after I shut off motor and park. It drained my battery and while recharging I heard a noise in the under hood fuse panel. I pulled out the fuse that was vibrating and the light went out but after placing the fuse back in the park lights refused to go out. So now I can not park the truck without pulling the fuse.

Why do my head lights stay on when the car is shut off?

I forgot to mention that not only are my running lights on but my head lights also stay on when the vehicle is shut off. I pinpointed through a Chevrolet website that it is the BCM; body control module.

What causes a car battery to drain when the car is off?

Keeping electronic items plugged in and operating, even after the car has been shut off, can drain a car battery enough to prevent it from starting the engine again later. A car battery might lose some of its charge for other reasons. An electrical short or an accessory that is not functioning properly could cause excessive drain on a battery.

What happens to a car battery when it is shut off?

Can a dome light drain a car battery?

Even a simple dome light left on by accident will draw enough power from the battery to drain it in a day or two, leaving the battery incapable of starting the car. Electronic Devices Remain Plugged In

Why does the battery light illuminate when the ignition is off?

It’s possible your alternator is not outputting as much current as it should. This will NOT cause the battery light to illuminate with the ignition switch OFF, but may cause it illuminate when running–does your voltmeter show at least 12.4V when the truck is running (ideally it should be 13-14.5V when running just above idle or faster)