Inspect the vehicle for third-party additions such as dash cams, OBD2 dongles, or auxiliary lighting kits that remain powered when the vehicle is ignition-off. To confirm this as the source, disconnect all aftermarket electrical devices and monitor the 12V battery voltage over a 24-hour period. If the discharge rate stabilizes or returns to normal, the accessory is likely drawing parasitic current outside of the vehicle's sleep logic.
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