Classic Cougar Community member coachJack has come to the rescue with his thorough guide “Everything You Wanted To Know About the ’67 Cougar Sequential Taillights.”
According to coachJack, he started with Steve Citrone’s “Sequential Signals of the 67/68 Cougar,” which provides comprehensive information about the system. Next, he added the “Sequential Turn Signal And Emergency Flasher Systems” which contains essential information, working diagrams, wiring diagrams and a troubleshooting flowchart. He then used Vic Yarnberry’s “Sequential Turn Signal Troubleshooting Guide” for the turn signal switch circuitry and troubleshooting. Last but not least, he read through numerous posts on the Mercury Cougar forum and the Classic Cougar forum, gleaning what additional information he could and integrating it into the document. He found Greg Murphy’s (devildog) format in which associated relays, their function, location, and indications of failure are described particularly helpful, so he incorporated that as well as adding additional notes, wiring information, and testing procedures for both off and on the car.
As you can see, the PDF file contains bookmarks and a handy table of contents for ease of navigation.
This was a huge effort and a great contribution to the community. Thanks, coachJack!