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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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