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JCC

X5 E53 battery parasitic draw

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Recently my X5 has started to flatten the battery overnight. It's a new battery and has been tested OK as has the Alternator. It seems to run down over a period of ten or more days.

 

There's no real draw seen on the Amps when the engine is off and I'm advised that it could be something starting up during the night and running e.g. Heater. I've started pulling the fuses one at a time (Telephone last week then Heater 34 & 64 this week) to try and isolate the problem - if there is one. Is there a cunning way to check this without a logger?

 

It's used mainly for short journeys so could it be I'm simply not giving the battery enough time to charge?

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The E39 of the same era used to suffer with similar issues and it was 90% of the time down to the hedgehog (I forget it's proper name now?) but it's the resistor that controls the cabin blower/fan for the climate control, this used to run when the car was "off" or in sleep mode. 

Check that to see if it's the cause? 

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