Physical Location of Connector/Junction 2A

I think the upper light is “powered” to what ever is fed to the relay.
Since it’s an LED, you’re likely only going to get that light to work 1 way.

What is the green wire on the new switch going to currently?

 

That is correct.

The green wire is going to the +12V side of the stock wiring (stock FR FOG relay side of the switch).

As I mentioned in an earlier post, I tested the full circuit with a mock load on the bench and it operated/illuminated correctly.

However, when I tested the same circuit without a load, the button operated as previously described (not illuminating the "ON" LED correctly).

 

This is how it is wired currently.

 

I'm not an electrical engineer, and it's been years since circuits class in college, but I find it odd that the button operates as intended on the bench with the mock load (the "ON" LED illuminates correctly when the switch is in the "ON" position) but doesn't operate correctly in the same circuit with the mock load removed (the "ON" LED does not illuminate correctly). I guess I need to bone up on my electronics knowledge to determine why this is the case (maybe something to do with the potential step down between the "ON" LED on its path to ground?).

But this is what spurred my original question as to the location of "2A"—if I could tap into the circuit between that bus and the FR FOG relay, there would be a load between the switch and ground (just as in the circuit I built in the bench when the "ON" LED illuminated correctly)—so I wanted to test that in situ. BUT 2A is in the engine bay and not in the cabin, so testing that or wiring it up that way would be cumbersome (at least too cumbersome for me at the moment). Still playing with ideas on this one.