The modern vehicles do have some complex controls regarding trailer lights! This came about when the turn signal lamps were separated from the brake lights, and further complicated by the mfg deciding everything has to go through as many "modules" as possible! LOL
A couple of easy tests... (I prefer a test light over a VOM because it puts s slight load on the circuit, simulating what the trailer lights will do.) Try connecting test light from the right turn terminal to the ground terminal. If it doesn't work, try testing from the right turn terminal to a known good bare metal frame ground. If it works there, there is a bad ground connection to the back of the plug.
If it does the same going to external ground, pull both plugs out so you can see the back side. Those are notorious for corroding the terminals, both loosing connection and bridging across with conductive corrosion. There are plugs with the lead wires potted in, I prefer those over the screw terminal type.
Some of the newer tow packages use multiple fuses, a fuse for every circuit to the trailer. Be sure they are all good, especially after plugging into a strange trailer.
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Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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