96 Chevy Tahoe, daytime running lights

i'm not an expert on that, but first, check to see if your brake light indicator on the dash is working.  on gm vehicles, the daytime running lights (drl) turn off when the parking brake is on.

with the ignition on, set the parking brake see if the red idiot light comes on the dash,  if it does and the drl (green) indicator goes off, then someone removed the fuse or relay that is underneath the hood.  with the parking brake on, the green indicator will turn off.

if there is no red brake light, then a previous owner may have bypassed the parking brake switch and/or remove the light bulb for the parking brake indicator.

the owner's manual should list a fuse location for the drl's and if it doesn't, call the parts guy at the dealer to see if there is a relay or fuse for it. (parts guys/gals are usually pretty helpful on questions.)

hhhhmmmm, just one more thing that i just though of, some of the gm cars have a light sensor that automatically turn on the headlights when it gets dim outside.  if you vehicle has that feature, you could have a bad module that controls both of those features.

if there is a module like that in your tahoe and everything else works, i won't bother finding and changing out that module.  the cost might not be worth it.

personally, i don't like drl's.  it just makes you more noticible to cops that you are speeding their way and they can pick you out from a crowd of cars.

me speed?   ha, ha, ha...

Ha! Ha!

I know what you mean though.  I just like to trouble shoot issues with my vehicles to learn more about them and how they work.  This is driving me nuts. 

I have checked all the normal fuses inside the door panel on the dash.  All the fuses under the hood.  I also followed the advise about the parking brake.  After applying the brake, the brake (idiot light) indicator DID light up on the dash AND the DRL light DID go out.  When I released the brake, the brake light went out and the DRL light DID come back on.  There was one Relay under the dash on ANOTHER fuse block next to the flasher relay.  I even replaced that.

As far as a light sensor, I don't even know where to begin to look.  Dash? Grill area?

Aahhhhh!

        And the answer is:  The Diode

       For all those concerned with DRL issues of them NOT working.....and WANT them TOO work. 

      The obvious thing would be to check the fuses, under the dash and under the hood.  NEXT, try the relay under the dash to the left of the brake pedal it is directly to the left of the FLASHERS Relay.  Still if nothing, as chuck_tempe suggested earlier, check the parking brake.  the DRL's are designed to go off if the parking brake is activated.  As soon as the parking brake is released, the DRL's continue.  Still if nothing.  AND I TELL YOU this is where I ended up.  There is a "Diode" under the dashboard right about where your right knee would be as you sat in the truck.  It is most likely black and has cooling fans all around it.  This needs to be changed out.  This was the answer for me. 

CHUCK_TEMPE- Thanks for your help!!!