Question about 2004 Mercedes-Benz Mercedes Benz E Class
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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