Laguna II Ph. II: Set left turn signal constantly burns fuse

Hello, I have a blinker problem again: Whenever I want to blink left, the 15A fuse burns through. I then replaced it and flashed to the right for a change. I turn left, burn the fuse again. Then I changed it again and actuated the warning flashing system: fuse burns through. Changed again and completed by keycard (wanrblinker goes on) -> fuse burned through. All other fuses (e.g. for trailers, STOP backup etc) are fine. I googled a bit and changed the warning flash switch (borrowed from another Laguna for a short time for diagnosis), but did not bring any remedy. In the attachments I marked the always burning fuse red and the two fuses, which I still suspected to be defective, green (are in order). Am I correct with my assumption that I have suffered a cable break somewhere in the wire harness? Could this otherwise also be done on the relay EDIT: I also blew through the connections for the trailer coupling with compressed air. Thank you for your feedback!