When i turn on my 2004 Trail Blazer the Low Beam ligths automatickly turn on, now they do not go on or even if i turn the switch to turn them on they do not work .
Check fuses & bulbs first, The headlight bulbs may be twin filiment type in which case the lower filliment may be blown & the upper filliment or highbeam will still work in this case replace your bulbs. But these models are renowned for having negative earthing problems. Follow the negative (-) or black lead from the battery to the point it is bolted to the vehicle. make sure there is good metal on metal contact with the negative lead & the vehicle. Then check the negative that comes out of the lowbeam headlight socket insure clean metal on metal contact. If you still cant find a fault, contact a chevy technician.
I'll bet both bulbs are bad. Also replace the plugs that plug into the bulbs. These are a bad design and allow arcing, which in turn blows bulbs. Remember not to touch the halogen bulb with your bare hands!
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