Join Date: Jun 2009
Location: Full Time Till Our Spanish House Sells.
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In my past life I used to be an Auto electrician, With many types of vehicles were brought in with a 'mysterious ' Battery drain. Even with all the fuses pulled and seemingly everything isolated, still it was showing a discharge. Turned out the alternator diode pack can fail and allow a current to flow via the rotor to ground through the voltage regulator. If you disconnect the alternator and the drain goes you have the cause.
Hope this is useful for you its rare but can happen.