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That is not a normal overnight drop. The 24 hours drop should be almost unmeasurable.
And the starting point should be in the 12.6 to 12.8 (conventional - AGM) range
The draw on the battery in circuit after 60 some minutes should be 30/1000 of an amp.
You have checked the grounding strap and all the connections I suppose. Measured the charging voltage at 3k RPM.
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