Ok guys this is a 97 Blazer.The drl's work fine but the night time lights do not.I replaced the bulbs and they still do not work.They were working a short time ago.I do have to flip a switch to turn them on but it wont work. No brights nothing.There are 2 bulbs in each headlight the lower ones are the drl's.Anyone know what the problem is???
Thanks

 

Have you checked the fuses both in-cab and under the hood?

 

I have checked the in cab fuses.I did not think there were any under the hood

 

Not having a '97 myself I can't be positive it does have an underhood box, but look on the driver's wheelwell side for a black box with a round **** on top to unscrew.