I took the resistors off and that had no effect they are still very dim and don't flash.
I was going to build the whole thing again and try the new one, but I found an Ngineering N8038 alternating flasher simulator in my parts box.
Hooked it up and only one side flashes. If I switch the wires then only the other side flashes. Grrrrrr see why I don't play with electronics, nothing ever works!