Compression Ignition Addict
Join Date: Dec 2007
Thanked 311 Times in 300 Posts
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Yea I agree, you don't have a Battery Charging issue as much as, what's called, a Parasitic Draw somewhere that's using-up your battery reserves.
You sound like you're not in an emergency situation with it, so there's things you can do to try to narrow it down. Next time it's going to sit for a few days let it do so with a couple of fuses removed (likely candidates are from the dashboard like the Radio, Cluster, etc.).
Do you have any accessories you added that might be doing this? Lights, Air Compressor, that kind of stuff?
But pulling a fuse to find the circuit that causing the draw could give you a better idea where to look...