Electrical problems Communication / Question

Hello.
have my fat guy after 5 months. Service life on 01.10.03 again put into operation.
He also jumped immediately and survived the first 200 km without any problems.
On 02.10. I wanted to start it again in the morning, but he said no more sound, battery was kpl. Empty.
Other (full) battery jammed, he jumped immediately and drove without any problems.
On 03.10. morning, battery back to kpl. Empty.
Then I got a measuring device (but only went up to 10 amps), connected measuring device, burned out overload protection immediately.
So bigger meter worried and see there, resting current consumption 12,xx amp..

Single fuses pulled and at No. 19 (central locking, door lock heating, roller for rear window)
Consumption went to 0.5x amp. Back up.
Backup plugged in again, consumption remained at 0,xx amp..
Now, my question to the experts.
Will control the central locking etc. Controlled by a relay, if so, can it have hung, and which is it?
Unfortunately, I don't have any power stations at my disposal!

Whisk all of you always a quiet, stoke-free ride!!
Greetings
Helmut