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Iceman,
I've been reading threads all week on this, and I do have two multimeters to work with. I'm just looking for advice on which of the many tests I should start with, or which component I should either focus on or eliminate early. In other words, where experienced hands suggest I begin.
Some thoughts:
parasitic drains: although possible, these seem to be unlikely since there is no reason to think they have suddenly increased enough to cause this.
battery: as I mentioned, it does fully charge, so maybe a weak cell? Never heard of that. Only 3 years old.
alternator: sure, could be failing to charge the battery, allowing it to run down. Shouldn't I get a dash indicator light, though? And I wouldn't expect the same slow recharge from the tender.
grounds: always suspect, but charging from the tender directly to the battery should eliminate them.
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