Help....cant drive at night! Headlights wont work

I have a 1997 GMC Jimmy S-15. The problem that I am having is that my headlights were cutting on and off randomly while I was driving. The daytime lights are fine, it only happens while the headlights are engaged.
While the lights are cutting off (almost like a battery is dying) there is a clicking sound and the source seems to be coming out of the glove box (I assume the relays). The problem seems to be slightly reduced while my High-Beams are engaged.
I have a good relay and tried to replace each relay in the glove box with the new one (one at a time). Didnt seem to do any good. All the fuses in the fuse box seem to be fine as well.
Now the situation has advanced. The headlights will not change from DDL (Daytime Driving Lights) to normal headlights.
Can Anyone Help...I cant drive at night!?!

2things that come to mind, ground or headlight switch is bad

Agree... headlight grounds or switch. I would look more to the grounds. They are attached to the core support, pull them off and clean the surface area and see if that helps you out.

Hi all, I am hoping you can help me out. I have a 97 GMC Jimmy whose headlights started working intermittently, sometimes affected when the steering wheel was tilted a certain way, you would just have to tilt again to get them back on. Then they wouldn't come on at all. I have drl and brights only. I replaced the switch (after reading the solutions here) but that didn't work. I don't think it's the headlights themselves, since they both went at the same time... What's the next step? I'm a newbie who can't really afford to pay a mechanic to diagnose the electrical system.
Thanks in advance for any advice!!
Michelle:banghead: