Location of a wire

Hey everyone its been awhile but i have been cleaning up my engine bay filling holes and smoothing it down this winter. But the problem is now arrising when i decided to hide my wiring harness. I have almose everything done but on one relay i cant find a wire. On my 93 i had 2 relays on the passenger fender, until i moved them into the car, one was for the fuel system and im not sure what the other one is for. On the one that i don't know what its for has 4 wires coming out if it, i have 3 hooked up except for a black one with a yellow trace. My question is what does this relay do and where does the other end of this wire go so i can go to the source and find the end.

Thanks for the help Drew
 
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