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Have you figured this out yet? Looks to be the last remaining 240 mystery on the forum.
My experience: If you're sure the battery doesn't self-discharge, as a result of it having been completely drained or frozen in its young life, the most common parasitic drain in a 240 is a result of missing insulation on the key switch and lock button switch in the driver's door. It shorts out and causes a continuous operation of the central unlocking actuators. One clue is intermittent operation of the locks.
The second most common cause, having eliminated glovebox, hood, and trunk lamps, is a failed courtesy lamp timer relay, located on the brake pedal bracket.
Next in line are any aftermarket accessories using unswitched battery, such as keyless entry, sound system, dashcam, or alarm stuff.
An easy way to eliminate some of these possibilities is to remove fuse 8. This fuse powers most of the on-all-the-time things that cause a parasitic drain. That would be a good start to diagnostics, if a quick solution is needed.
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Art Benstein near Baltimore
Does running from my responsibilities count as cardio?
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