At the flasher unit there is a ground wire that sounds like it is not connected. Here is a guide and the blinker wiring diagrams so you can see how the system works and how to test the ground:
https://www.2carpros.com/articles/how-to-check-wiring
Please test the ground and let me know how it goes.
Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
Cheers, Ken
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Sunday, July 29th, 2018 AT 1:33 PM