Thanks for the description of the wiring on the Gen 1. It turns out the Gen 2 doesn't have the inner fender as described, but the 6 conductor connector was helpful. It turns out that each side has such a connector just under the headlight. Unplugging it and testing voltage shows the passenger side turn signal to be a green/purple wire and the DRL a purple. The driver side turn signal is white/yellow and the DRL is blue/white. The driver side is much harder to get the connector unplugged, but easier to work with as the wire harness is longer. The passenger side connector has better access, but a very short wire harness.
Ultimately got both sides installed. Had to use the clips as the silicon content of the diffusers prevented the double stick tape from being secure.
The passenger side looks awesome, the driver side seems to be defective. It works, but is quite dim compared to the passenger side. I did pre-test both strings, but not at the same time so did not notice the huge difference in output.
Also, those connectors are secured with little red plastic keys, both of which I dropped and the Volt ate. Does anyone know what they are called and/or where I could source them?
Assuming I can get the defective part replaced, this has been a fun little project and even my wife who doesn't have ANY interest in such frippery was quite impressed by the look of the string on the passenger side.