Moin moin, my 850er has some problems with his NSL and the TÜV is at the door. She registers rather sporadically to very rarely. Switch in the dashboard is i.o. fuse is i.o. lamp is i.o. 12V arrive at the version. I thought it might be because the relay does not allow enough power, but did not find any in the driver’s footroom on slot 7. Is probably only a relay for front… trailer coupling is therefore not the cause as for vi Ele here. Don’t really know what to do … Lg