New Head lamps, low beams work, high beams and fog lights do not work, fuses are good
I'm not sure about US vehicles but here in the UK you can't run high beam and fog lights, it defeats the purpose of fog lamps in that they see below the fog which starts generally about 2feet from the surface. I'm sure someone will correct me about that!
Anyway, have a good look at the relay box, ascertain the high/low and fog relays and see if they can be swapped with another to test. Make sure any relay swapped has the same pin configuration and rating. Next, check out the headlamp/foglamp ground connection, its usually down behind the lamps and may have several similar coloured wires going to a heavy screw or bolt. Loosen the connection, wiggle it about to clean it and retighten. See if its made a difference?
I suspect it is the headlight switch
SOURCE: low beam headlights not working on 2004 Pontiac Montana extended
You headlight lamp have a diffuser mechanism which allows it to flip between the hight beam and low beam feature of the bulb. In fact, you high beam will function even if the low beam is not working.
I would recommend the purchase of the new headlight lamp. It would cost you you any where from $15.00 per unit to get a replacement lamp
SOURCE: headlight trouble on sunfire 2003 with 2.2ecotech
sounds like either a wiring loom is shorting across somewhere ??where ----best of british to finding it
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