I wish I were more electrical saavy, I don't see one. As noted I didn't put the car together. I really don't think the early Contemporary cars did. It has to be going through the flasher unit. (Doesn't it???) It's a pretty simple concept. Contemporary specified a #550 flasher but I'm wondering if I got a bad unit when I replaced it. It flashes the right side but not the left, which seems like it could be caused by power feeding back through the system form somewhere. I would have thought disconnecting the lamp and essentially inducing a short circuit within the short circuit would allow the left rear blinker to flash, it doesn't. The exception to this would be if the original short was closer to the controller.
The lights being on / staying on screams bad ground someplace. Every person I have posed this question to says bad ground. My own experience tells me 90% of all elecrical problems with these cars is a ground related problem. I will triple check them.
Something which occurred to me was the turn signal switch may have developed a fault.
Is it logical that I can reverse the turn signal switch connections to change the left blinker and right blinker orientation? The switch doesn't care which side of the system it's operating... If I do this the left blinker position becomes the right, the right becomes the left. If the left blinker becomes operational and the front right parking lamp / blinker filiments stays lit, it is very possibly the turn signal stalk assembly. My assembly looks not unlike something out of a VW beetle, it should be easy to fix or replace.
Unfortunately Contemporary's assembly doesn't cover malfunctions or troubleshooting operations. After 18 years of trouble free service I guess I can see the wisdom in that.