right running light is not running

[viperlp01]

Ok guys i have already tried to get a answer out of this one but last time i didn't get anything. My right running light is not running when i turn them on but my left running and me turn signals works. I have switched the bulbs but nothing. I have tested the inlet to the socket for the light with a multimeter and i read low voltage. I was told that it could be a ground wire but i havent a clue were i can find that because everything is so tight i can barely get my hand in there. if anyone knows where that ground is located so i don't have to tear stuff apart i would be appreciated. OR if you have any ideas.
TY John

 

[Locke]

the ground for your bulbs are black. I would track the wires through the bay, looking for obviously bad stuff (melted wires, wires touching exhaust, etc...) and check the relays.