i bought the car with custom led lights and they recently went out so i took the lights out without looking what wires were connected to each other. now theres just 2 wires one copper and the other silver coming out from the dash and i dont know what one is positive or negative so i could hook the red and black wires from the led lights to them
anyone know how i can check what one is which?

 

Does not matter which wire,get a test light to see which one is hot.