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Posted on Aug 13, 2010
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BMW 735 i drains power from battery in about 2 hours

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Donald DCruz

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  • BMW Master 17,130 Answers
  • Posted on Aug 13, 2010
Donald DCruz
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Joined: Jun 24, 2010
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The fault can vary from any leak from the numerous circuits and the best possible way if to check the drain current from the battery. Disconnect one by one the fuses to the various circuits to confirm on the high drain circuit for probing the suspected device. You can start from the audio/ video/media/ power amplifiers/ remote system/accessories etc to confirm the fault in the device that is draining off the battery. You must try and check with isolation of the tested circuit. An easier way is to check on removal of each fuse and connecting the ammeter to see the drain, any circuit with higher drain mustl be suspected and probed. Check if you have not connected any accessories directly. Hope this advice helps you out to try. Good day

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