Fog light issue after installing new bulbs

[Sion-1]

Hi I am a newbie
I have a 2012 seat leon FR+, I decided to try and get all the headlights and fog lights a matching colour. So I baught some Mtec hb4 cosmos blue fog lights (bulb and connection). I've fitted them this evening and all of a suddern only one side is working, bearing in mine before the change of bulbs both fog lights were working fine. I've tried both standard and new bulbs on the left hand side and there's nothing, I tried them on the other side then incase it may have been a faulty bulb but the right hand side works. Just wondering if anyone could help me
Thanks

 

[GordieC]

Same thing happened to me. Take the fog lamps back out and use some emery cloth on the connections as they will likely be corroded resulting in a poor connection.

 

[Sion-1]

Okay thanks for that
Will try after work