I'm wiring up some LED headlights and I must be confused about negative switched lighting. I was under the impression that the orange wire is a constant 12V with Blue and Pink being switched to allow either high or low beam be activated. This does not seem to be the case at all, I did do some multimeter testing. I'm also not sure how the high beams work as it seems to just dim the bulbs but somehow changes their pattern

(These colors do not represent the schematic and voltages may vary)
Low beam
From black to blue 5.3v
From black to red - 3.8v
From red to blue 8.6v
High beam
From black to blue - 4.5
From black to red 3.4v
From red to blue - 8v


From my understanding on the low beam power goes from Red->Black->Blue
From my understanding on the high beam power goes from Blue->Black->Red

Black would be Orange in this case, this goes entirely against what the schematic shows, am I missing something here? I did create a setup that excludes the orange wire entirely and neither headlight lights up

 

Your understanding of the headlight setup matches the schematic.

You won't be able to get voltage measurements with this setup because half of the grounds are floating. Also, the daytime running lights are from a back-feed off the RH headlight, so that may cause issues as well. I think you would be better off doing a resistance check between the grounds with nothing hooked up. You'll get 0 when that particular circuit is selected.

If your bulbs just dim when high beam is selected with regular bulbs, I would suspect something is wrong with your wiring, connectors, or bulbs.

What type of bulbs/lights are you trying to install?