Why is my 2000 Taurus passenger side headlight dim??

I have replaced the bulb and even the socket, no change. Most people will say: must be a ground. Duh! But how do i go about fixing this? I also noticed while backed up to a wall that the tail light on the same side is just slightly dimmer than the other, but the headlight difference is alot worse. Do i need to just run my own wires or what?? Please help!Why is my 2000 Taurus passenger side headlight dim??
You should check for corrosion in the bulb socket. Spray some WD-40 in it and then plug the bulb back in.Why is my 2000 Taurus passenger side headlight dim??
Check you ground wire on the light most likely that what the problem isWhy is my 2000 Taurus passenger side headlight dim??
the ground wire

what is the difference between

pc or mac