Dim Low Beam on 2001 Ford Focus?

A few days ago, I tried replacing my headlight bulbs with halogen ones, but one of them burnt instantly, so I installed the old ones back. The problem is that now the low beam is very dim, I can't see anything at night. The high beam works perfectly (high and low beam are in the same bulb). Also, when I switch to the low beam, the high beam indicator on the dash is dimly lit. Any ideas on what the problem might be?

Unplug one of the headlights and see if your indicator stays the same, then do the other. You should be able to isolate the side that has a problem by doing that. If the problem clears up you probably shorted out some of the wires in the headlight plug. I would try wiggling them around and see if that helps.

When you install a halogen bulb you can't touch it with your bare hands. Oil from your hands will get on the bulb and cause it to burn out prematurely, don't know if that is what happened to your halogen bulb or the bad wiring burnt it out.

Wiring fault somewhere, my guess is the lamp holder.

Thanks! Turns out it was a poor ground connection+a blown fuse.