I had the exact same problem. Everything checked out ok at the garage including the earths. Finally we discovered that it is very easy to push the bulbs in in the wrong position and they will work but they are too dim. There is only one way that they are supposed to fit in, as soon as we got them slotted in correctly - bingo, dazzling headlights!
SOURCE: upgrading nissan almera dipped headlights?
I would have the complete headlight circuit checked out by a competent tech before buying more bulbs.
SOURCE: dim headlights on 2006 buick lacrosse
check the earth wire first,wattage on the bulbs in case their wrong or old type bulbs ,check supply voltage ,if all ok then fit aux spot lights .if still having a problem have eyes checked as over 40 the old peepers can deteriorate ,dont know the name of it but it can affect some people at a younger age than others,glasses will not correct this problem.
SOURCE: 2004 Cavalier Day/dim lights not working
I finally got mine fixed!! It was the crossover wires between headlights(the wires that run in front of the radiator). One wire was torn into. Spliced them and taped back together. Hope this works for you!! I also used something called wire caps that help hold the spliced wires together. I found this solution on yahoo.com search engine where someone else had suggested this. My only problem was no dim lights, but all the other lights worked fine.
SOURCE: dim headlight don't work but bright does and bulbs
If the low beam doesn't work, the bulb is burned out. You can verify this by checking for 12 volts at the low beam bulb socket
SOURCE: 2003 Grand Marquis headlights will not function in
have you checked the ground for the headlights
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