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1967 GT500
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I have electrical issues that I am trying to figure out. I have confusion however. My problem is very similar to what is in picture 1 of my 1967 cougar, mustang, fairlane, falcon, mercury shop manual. That manual mentions fix could be 4 wire turn signal indicator relay. According to the wiring diagrams, I haven't gotten behind dash panel yet, there is a turn signal flasher and an emergency flasher. Picture 2 shows what is being sold for both applications today. They are not 4 wire though unless you add them together. Further confusion are pictures 3 and 4 showing original EBay flashers which have more than 2 wires, but not 4. What is service manual referring to regarding 4 wire turn signal indicator relay?
 

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I think the cover of your Service Manual tells it all. Since it covers several models of Ford production, there will be that many different wiring systems/diagrams. If you have a 4-wire flasher, that's how you troubleshoot it. If not, use the wiring diagram for what is in your vehicle. My Factory Service Manual for my 66 has a similar format (diagram for all, except Comet) and so on.
 
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