IMHO, get or borrow a digital meter with DC amperage capability. Set the meter to around 2 amps, and take the negative lead off the battery then connect the meter BETWEEN the battery negative terminal and the wire you just removed. You should get a reading of zero or very close to zero. If you do not get this result, you have a parasitic load. Then you can do as noted above and start removing fuses one at a time until the reading goes to zero. I have seen radios, anything plugged into a USB socket, the speedometer and some other accessories cause a drain on the battery when the device is supposedly off.
Please feel free to send me a PM if you would like discuss further.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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