I told my fellow local Tbird club member Stan ~ also Spanky to us here on our Forum, that I would post this information in the Technical Resource Library and share it with ya'll. He had been having a problem with his '66 Flairbird sequential tail lights. A previous owner had probably also had that problem in the past, if the wiring regarding it was any indication. He said his initial problem began with stuck on stop lights and moved upwards from there. The old relays had given up, and what was there was not OEM. He said that after troubleshooting for some time and trying to fix the problem he finally had to give up and purchase a new electronic turn signal kit set up. Here is what he got. He did some research and found that there is a replacement kit to fix this problem and he bought one from Larry's Tbird Parts. He said other tbird parts houses also sell this unit. In Larry's catalog the part number is B 13367B and is found on page 56. Its a plug and play installation, easy to install and has been working fine since he recently installed it. Here is the link to Larry's website. You can see the item and the cost there. I will also post some pix of the unit and the wiring schematic. I have since found out that the B model is for Flairbirds built prior to 11/16/65. There is a C model that is for Flairbirds build after 11/17/65. The second link is for it.
Click on the schematic to enlarge it and print it out.
If anyone decides to go this route, I am sure he would be glad to tell you how he installed it. It is not difficult at all. He did give me a word of caution though and that regards installing the green wiring. One of them has a white stripe down it, as I recall, and one does not. He said to be careful attaching the green brake light wires, as he reversed them and didn't have stop lights. As soon as he figured what he had done, he fixed that and that fixed the brake light problem.
I just posted this information in the TRL also.
Stan just sent me a pic of what his installation looks like after he installed. Also, I just talked with the owner of the company (Cougars Unlimited) who manufactures this unit, Vic Yarberry, in New Mexico. I will have a lot more to say about that. He markets a unit for the 1964-1971 Tbirds and also Cougars.