hi i have a 01 expedition and i changed my factory headlight to the euro lights,so my driverside light went out and changed it(H1 bulb) but when i changed it, it still did not work so i turned on the brights and the brights work,so i went and put the factory unit back in and the same thing the brights only worked does anyone have any hints that can help here what is weird is it is only the driverside,well thanks