Any thoughts what would drain a good battery overnight? I have checked each fuse with a multimeter and do not find any current draws.

Need to check total amps between batt + and cable with cable disconnected
Many systems have power direct from battery through fusible links.
Headlight motors will drain power if limit switch not engaged for instance.

Any thoughts what would drain a good battery overnight? I have checked each fuse with a multimeter and do not find any current draws.

What year vette are we talking about here?