I know you can have issues if you go with a hi/lo beam set up.
I had to swap 2 pins in the blue plug on the relay harness. I guess the 9000 series bulbs share the same plug, but some have single or dual filaments.
It also depends on how your relay harness is configured from factory.
The rest of the wiring is pretty
Simple. relay harness ties to battery then the plugs for the ballast side are polarized. You get your relay signal from one of the head lights
plugs and you ground the ballasts where they mount.
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