There were no instructions in the box, the relay has 2 yellow wires which can be confusing. After figuring out how to connect the relay, I found a place to mount the relay and then added longer wires to the relay connector, using soldier ring shrink butt connectors to ensure a good connection. I marked the wire from terminal number 87 with green tape, then connected the red wire to positive and the black wire to negative on the terminal block. Then I connected the yellow wire to the yellow wire on the headlight and the green wire to the green wire on the headlight harness, the blue wire is not used so I put a cap on the end to make sure it can't arc. Then I sealed the connectors and tied the wires so nothing was dangling or dangling. I hope this helps good luck and be safe.
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