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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Bill Boyd

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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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Please leave fair comment if you think I have helped.

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I’m happy to assist further over the phone at

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