What are the 3 wires that come out of the 9004 headlight harness for, where do they go to? I have one wire that has been clipped and is just hanging there, there is also another wire i have that hangs in another place and when i connect those 2 wires, my passenger side headlight gets brighter! It bugs me not knowing if i need that wire connected and what does it go to and whats it for?

-Mike

 

the black one is ground
one is low beam power, the other is high beam power

 

Ok, I think the High beam power wire is the one that is just hanging. Because when i connect it to the other wire that is the same color as it is the headlights get brighter! But i still dont have high beams on that light. Could my high beams be burnt out?