Wiring help needed

Hello all! I'm trying to rewire wire my engine bay almost 20 years after I took it all apart and im having trouble remembering where everything went. All I have is a 20 year old picture of the car before it was dismantled lol. What is the relay that is circled in the before picture? Its beside the brain box on the driver's side inner fender on a 1975 dodge dart.

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