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 - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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