The sides work independently. Won't matter if one side isn't hooked up, but it -might- matter if you have one side hooked up wrong.
Resistor on the park light wire won't do you any good. Won't hurt the resistor as long as you have it connected to a power wire and a ground wire. Two power wires would be a short...
Man, really dunno what you've got going on there. Again, wish you were closer.
As usual, youtube jacks up the smoothness of the video, they actually flash very normally. Not this jerky/stuttery/fast kind of appearance the video has. The somewhat weird turnoff when using the hazards though is real; not sure why but they're just kinda off from each other. Turn signals work great.
This just fixed my lights! I tried no resistors, then 2 on each side because they came with the bulbs. if i un pinned the turn signal wire they came on ok like there is some low voltage through the turn even when not signaling. i also had a resistor for the corner markers because they seemed dim. took all the resistors out except the one on each side and sure enough they work!
Thank you Richard!