Issue with turn signals in 70 Dart

Thanks for the help on this guys. I tried swapping bulbs with no luck, so I finally pulled apart the bulkhead connectors and sprayed contact cleaner in there. I then pulled the relays and gathered up all my known wording relays and tried them all. No luck with any. I went into the back and found an ancient relay, no idea if it worked, put it in, and hey! The signals work again! Right on the side, it says Made In Canada. I looked at the other 6 I had, made in Taiwan, China, Germany, etc. Coincidence?