Hi there, I am planning on making a special trailer wiring adapter which converts from an Australian vehicle (which always has yellow turn signals) to an American trailer (which in most cases has red stop/tail lights/turn signals combined). This is just in case I'm planning on taking my own car to the USA (which can require special paperwork to be done). I am intending to wire an American 4-pin flat socket to an Australian 7-pin flat plug. An electronics retailer called Jaycar has the American plug/socket for only $8. https://www.jaycar.com.au/4-pin-wired-multi-pin-plug-socket/p/PP2030 Here, this is an example of an Australian registered car in the USA: This is because I want to keep the Australian trailer socket on the vehicle. Thanks.
There are some US cars with amber taillights; to tow a U-haul trailer, I needed a converter that wired in to my loom, then terminated as a 4-pin plug, similar to the one you have up there. I believe this is it; if you need confirmation, let me know by PM and I can swing by the local U-Haul dealer and confirm it, or get the proper part number for what you need. https://www.uhaul.com/MovingSupplie...le-Wiring/Taillight-Converter-59236/?id=19814
Found a ready-made one on a site called Rover Parts. https://www.roverparts.com/parts/9438 Also, if I get any US imported car (particularly one that predates the Australian Design Rules aka ADR) that has the US hitch/socket fitted, then there's the 'Trailer Light Converter' which converts from US to EU/AU https://trailerlightconverter.com/