Question about 2004 Mercedes-Benz Mercedes Benz E Class

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Can the current usage by Speedo-Meter when car is switched-off which can drain the battery completely overnight

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To check this remove the earth wire on the battery and connect an amp meter in the circuit. If the current draw is less than 1 amp ( even that will be excessive for instruments ) the battery should last 48 hours . I would be checking for a heavy current draw indicating a unit shorting out internally or a battery that has an internal short problem. Have a load test done on the battery to check this. Clocks and speedo and odometer always use power after being switched off as that is how they keep time and mileage recordings so the current draw is in milliamps. Even the ECM draws power when off as that is how it keeps the CPU program going and why sometimes the problems start when the battery is changed out or disconnected.

Posted on Apr 12, 2014

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Posted on Jan 02, 2017

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


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I have a 2008 Ford Ranger with a good battery, good connections, good alternator, etc. I have been trying to,figure out why the battery is draining overnight only. This happened twice and both times


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Remove the battery's positive cable.

Connect the multi meter's positive probe to the battery's positive post while simultaneously holding the negative probe from the multi meter up in the air, to keep it away from anything metallic.

Place the negative probe of the multi meter on the end of the removed positive cable to complete the circuit.

That's right, you're putting a negative on a positive, but its ok, because if the drain is severe enough, you're most likely to blow a fuse or two, which will identify the problem area.

Above I said to remove the positive battery cable because that is the way I do it. You can do the same test with the negative battery cable removed. In fact for you that may be a better way to do the test, because there would be no way for any electrical issues to occur by accidently grounding the negative probe from the multi meter. i hope you understand what I'm saying here.

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1 Answer

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easy find and fix. if you have 1 tool, an ammeter. (DMM)
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it means, simply, SOMETHING, is not turning OFF.
so in the dark look for glowing lights. look an all places.
glove box, too, compartments... ALL !
if no lamps on, then its something else.
all cars have 2 power feeds.
1: switch power (key switch)
2: hot all the time. (bingo there)
some lights are hot all the time, Head lights, dome.
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here is a page dedicated to finding it 3 different ways !
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all cars work the same (power DC) but parts of it are moved
about to make it challenging.....

http://www.fixkick.com/drain/drain.html

the first trick is to measure the drain.
then pull fuse 1 by one until you find the branch that has a drain.
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Battery a 1.4 amp drain overnight wont start and they said its not the battery or alt. with the key off and nothing on it still has a 1.4 drain


Hi there

Dont know the car,but its about the correct current for a lamp.Check the boot light switch ,it is normally the only one people dont check.

Otherwise connect an amp meter inline with the battery and remove some fuses ,one at a time until the fault is gone ,and then you will know what circuit it is.

Please leave fair comment if you think I have helped.

Thank you

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Try to check the battery maybe your battery is over use or you need to replace the battery or check your alternator and check the fuse of the car.

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