2003 Boxster S - Problem with Lights..
 

I changed my left hand side fog light with a H7 instead of a H7U. Since then, the fog light I replaced lights up, but is dimmer than the one on the right hand side, the left hand side turn signal indicator stays illuminated and the high beam doesn't light up on the left hand side... All the issues are on the left hand side... Any suggestions??

Generally, if you do something to a car, and it makes a problem. Start from the thing that you replaced. So try putting in an H7U?

And if you dont want to go buy one, swap the one on the right for the one on the left. Simple test.