Hello On my car (BMW E30, Jg. ’89, no check control or anything else) I intend to tap the original rear light cables by means of a universal e-set (power thieves or soldering) and thus supply the trailer with lighting. Question: If there is no trailer on it, and a flasher bulb fails, it is known that the turn signal becomes faster on the side. Then, when an additional flashing light (follower on) is attached, the turn signal would have to slow down? Is that so? If yes, then if a trailer flashing light fails, would the “normal” flashing speed be reached again? Should this be the case, or do I need a trailer flashing relay which also generates a normal flashing frequency with a trailer? Then it would be too slow again with a suspended trailer? Either a relay is designed to supply 2 (without trailer) or 3 bulbs (incl. trailer flashing) per side, and from this load the frequency is also derived? Then it will doc h always only turn off the trailer or turn on the trailer correctly? How does that work? I was told elsewhere that the flash frequency will be faster in case of failure of a trailer flashing light to indicate the failure. How should the car know if a flashing light has failed on the trailer or if there is simply no trailer clutch installed. That would be the same electrically?