You say, .... "both posts in the factory coupler blink juice when either turn signal is on..."
Well the good news is; in that case, your trailer is working as it should.
It would seem the problem is within the truck plug itself and the two turn signal wires are common, i.e. connected together. The puzzling part is why it does not back feed into the truck and cause both turn signals to light. Perhaps the truck plug has diodes to prevent backfeeding - to test this check the two turn signal wires before they enter the plug.
The reason I suggest such a goody idea is that I used diodes to convert my 1993 Ford which used separate filments for the brake and turn signals to work with my old trailer which shared brake and turn signal filments.
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Today's Featured Article - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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