To resolve the problem you need to make 3 measurements.
1. Alternator output voltage 14.4V, measured with a charged battery.
2. Battery self discharge. After removing the cables, charge the battery until the current meter reaches the end of charge level and stops decreasing. While charging measure the charger voltage for 14.4V. Remove the charger, after 24 hours reconnect the charger and watch the current meter. The current should be the same end of charge level after 5-10 minuets.
3. Alternator leakage current. With the engine off remove the alternator output wire, measure the current between the alternator and the battery wire. I measured three Delco alternators, 1.96 mA, 1 uA and 1 uA (1 mA = 0.001A, 1 uA = 0.000001A).
A 45 Ah flooded lead acid battery with 2% per day self discharge is 0.9 Ah per day.
With 2 mA alternator leakage the discharge increases by 0.05 Ah per day for a total of 2.01% per day.
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