Question about 2007 Mercedes-Benz C-Class

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How to check if one of the fuses are running overnight on your 2007 c280 4matic?

Causing battery to drain

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Use an inductive amp clamp on the battery wires

Posted on May 06, 2014

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Posted on Jan 02, 2017

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My Passat 2006 kept draining battery overnight, after a new battery & alternater still drains new battery overnight? Can't seem to find the problem? Any idea?


You need to disconnect the battery negative lead and place an ammeter between battery and lead, note the current draw with every thing switched off, then start removing one fuse at a time from fuse box and see if ammeter drops significantly if not refit fuse and remove the next one and repeat this until you find the one that causes a significant drop, then you will have found the circuit that is draining the battery, you need to check this circuit to find cause of power draw and repair as required, let me know how you get on

Dec 18, 2015 | Cars & Trucks

1 Answer

My 94 jaguar xj6 battery drains even if the car is turned off what could be causing this


I have less than fond memories of tracing electrical troubles in a Jaguar (though much older than yours). Here's the basic process you need to follow:
1. Pull all the fuses. Does the battery drain overnight?
If yes, then a circuit that is not fuse protected is the problem. Start with starter/solenoid, etc. Disconnect each thing and test with meter.
2. If battery drain stops, then use meter to check current drain on each fuse. One will have more than a trickle.
3. Once you find which system is draining, you can narrow it down further by disconnecting each thing on that circuit.

Yeah, It's a pain, and may take days, but you can find it.

May 29, 2015 | 1994 Jaguar XJ6

1 Answer

How is 2001 Mustang GT parasitic draw on battery related somehow to FU 27 and FU39? Battery drains overnight but I cannot narrow down a faulty component.


Allfordmustangs.com has an article if you Web search your car with fuse 27 and 32 as part of the search. It blames the GEM as part of the problem(wiper) and also points out that the radio has several power feeds. Fuse 27 is hot all the time, but fuse 32 is only hot in ACC or Run. So as long as you can test fuse 32 to be hot in only Acc or Run, it should not drain the battery in Off position. You might want to test the ignition switch to verify it is really turned off.

The all mustangs article had different symptoms, as you did not indicate whether the fuses popped.

The wiper motor is suppose to derail and turn off. If you can unplug the wiper motor overnight and the battery stays up, you would know that it is either the wiper motor or wiper control. The radio is on the other fuse circuit. But whether the radio can drain a battery in a short time, you need to measure draw, but if the fuse pops, the battery should stay up. Again, disconnecting a circuit like a radio, and then having the battery stay up, would point to the radio circuit being at fault.

Oct 14, 2014 | 2001 Ford Mustang GT

1 Answer

Check battery drain using test light


Check for any of the interior lights especially the glove box staying on, or one of the door switches stuck in the on position.. Other option is to pull all the fuses, then replace them one at a time overnight and monitor the battery. Soon as the battery gets drained you've found the circuit causing the problem, then troubleshoot that circuit.

Aug 25, 2014 | Cars & Trucks

2 Answers

Why does my 96 Cadillac Eldorado battery keep discharging?


First step have the battery tested, a bad cell can cause a internal drain and kill the battery, if the batt is ok then check for interior lights like visors that stay on or interior light that come on by themselves at night due to defective door switches.

Dec 27, 2012 | Cars & Trucks

2 Answers

My 98 lumina has a constant power draw from somewhere. I just replace the battery and had the alt tested (it was good). I have to jump the dang thing every morning but if I drive it enough during the day...


The alternator may charge fine but could drain the battery through a bad diode,have you checked the alt for a bad diode?Disconnect the battery positive cable.Put a regular 12v test light between the battery positive post and the positive battery cable.If the test light is bright you do have a drain,if dim it is OK.A dim light may mean the drain is internal in the battery.If you do have a bright light remove a fuse ,one at a time from the fuse box until the light goes dim.Once dim you have identified the bad circuit.If removing all fuses do not dim the light,disconnect the alt charging wire at the alt,if that dims the light,then you do have a bad diode.DO NOT create a drain(bright light) when checking for the drain by turning on the key or opening a door/trunk etc.
Also,do an overnight battery check by disconnecting the battery overnight,if things are fine the next morning after the battery was disconnected then it is a drain in the vehicle,if the battery is dead even after being disconnected overnight,,then the battery is bad.

Jun 15, 2017 | Cars & Trucks

2 Answers

Where are the radio fuses for a 2001 Dodge Dakota? When the truck sits overnight, when you go out the next morning to start it up all I get is a clicking noise from the starter. I checked the battery and...


leaving the radio on all night would not cause the battery to drain away like this providing its a good one .try disconnecting the battery overnight and see if it still drains as sometimes a battery can drain flat on its own which is caused by sulphation across the internal plates in the cells ,then if if it starts the next moring the battery is ok ,so next is to discoinnect the alternator large terminal off the alternator and try that and if it starts the following day renew the alternator as a rectifying diode is down running battery flat ,if still a proble then out comes the tester to look for a relay that has the contacts stuck together or the favourite boot light but this is a pick up truck so i would suspect the alternator

Feb 04, 2011 | 2001 Dodge Dakota

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