Which relay?

I am operating a device that requires a signal ('plus' 12V, fused with 5A). There are three types of relays. But which circuit is the right one? The signal should behave exactly like a rear fog light: If the ignition is off, the signal/fog light is always off. When the ignition is on, the signal…

Trailer plug assignment for 7-pin plug with 8 cables?

Hello, The plug on the trailer, which was connected with an additional cable (for the reversing light?), was stolen. A new plug has now been connected. except for the additional cable (white, see photo) None of the connectors are intended for the rear light. Where do I connect this cable, which is obviously intended for…