Aftermarket LED Fog & Tail

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Hello,

Suitably an electrical question but I wont know unless I ask.

I bought aftermarket LED taillights for my Audi A4.

There are one tail light, one stop and tail and one fog & tail light. The only one not working with the vehicle is the fog and tail.

The bulb does not light up in any way. I would like to obviously.

Can anybody help? (Without telling me to revert back to the old bulbs)

 

[dieseldave]

Got a set in a car shop in Cahir, which was sent originally from Dublin, found that the connectors in the boot were a bit flimsy, they looked good when working but flickered on/off on one side, decided to go back to stock, didn't fancy someone crashing into me, or the unwanted attention from john law.