Hi, Jim Rippy,
you need to find the draining circuit with a multimeter.
Disconnect negative cable from battery and messure voltage between plus and minus side of battery, should be around 12.6 volts or better.
Then connect one probe to the minus pole and one probe to the ground, i.e. some shiny metal. If a circuit drains to the ground, you should read that small current flow now in amps or milliamps on the multimeter.
Now have somebody pull a fuse. If no change in current flow, this circuit is not leaking. Fuse back in and next fuse pulled until the current flow drops close to 0. That would be the circuit that has a faulty ground connection somewhere and that you then need to investigate.
Good luck
Reinhard Kreutzer