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it might be grounding out check wires
When it is raining during the day you should always keep your headlights on.
why does fuses keep going out
yes
There are several things that can cause your 2004 Chevy Trailblazer headlights to keep going out. The most common cause is a loose or corroded ground wire.
The alternator is on it's way out.
rewire them.
check your battery cables loose or dirty cables will cause this. if the problem persists check the reg/rectifier
I had the same problem. It was my alternator. Be careful, mine died on the way home.
it's your headlight switch
Headlights run off the battery not the ignition...
"dirt on the headlights can reduce their effectiveness up to 50 percent." drivegreen.com