Things to check:
1) plugged in correctly?
2) did it come with a bulb? If so, tried swapping with your old bulb?
3) check your fuses and make sure the fuse for that side is good
4) not sure if the control module ("ballast") is good on that unit - does anyone know if the ballast from a ZKW assembly works with an AL assembly? It might be something to try (using your old ballast - I'd let someone chime in on this one first though)
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