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Have you left it sit a couple of days with the battery cable disconnected, to verify that the batteries themselves stay "up"? Ignition, or light switches can get moisture, dirt, and corrosion inside them, and bleed off power, as well as any other switch, circuit breaker, or relay. Are there insulated terminal strips used up behind the gauges that could have a buildup of conductive dirt and moisture? Get a TINY (very low current draw) 12-Volt light bulb (such as a low-wattage instrument bulb), and connect it between the disconnected battery cable and the battery post. If you get a small enough bulb, even a "leak" down in the mA range will cause the bulb to glow (turn off the shop lights), and when you disconnect the offending electrical component or circuit, the bulb will quit glowing. Or, simply disconnect whole circuits, one at a time, such as the charging system, then the lighting system, etc., and allow ample time to see if the batteries stay up. When they do, you will have localized your "leak".
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