C max headlamp units

[Crackastone]

Hi out there, would appreciate some advice if anyone knows how to help with this one....

I started fitting new headlamp units to my c max only to find my sidelight stopped working on the driver side( I didn't fit the passenger side as wasn't impressed with the situation) when I put the old the headlamp back in the side light worked fine. I checked all the bulbs and assume the fuses are ok since the lights still work. I also checked the new wiring and sockets in the new unit and they seemed fine. Is it a bad earth? Or am I missing something? I checked and checked the bulb was seated in the socket too. Hmmmm

[jeebowhite]

Could well be a bad earth or connector.