Need help ASAP headlights wont turn on

[85cHeavyMetalBogger]

I have a 2000 blazer zr2, the headlights are automatic but they wont come on. even when I manually turn them on with headlight switch they still don't come on. I checked the fuse and it was good. any ideas of what the hell it could be?

[marshall]

No tail lights either?

[J.C.]

Bad switch? Faulty ground?

[xjs3667]

Check the relay...

[85cHeavyMetalBogger]

have tail lights, break lights, turn signals.  noticed today they came on when I put it in gear, and while in gear I turned headlight switch on and they turned off. I will check again when it gets dark.

Where's the relay at?

[xjs3667]

I believe its under the hood with the rest of the relays/ maxi fuses.... if the lights are going off when you turn the switch to on, it sounds like you got a short somewhere....id start with the switch...

[Chevy Racer]

High beams could be on too and have a short there.  Been there before. No headlights, clicked the high beams off, and I had low beams.

[85cHeavyMetalBogger]

High beams don't work either.  Could it be a short in the multi-function switch? 

[xjs3667]

Yes...its most likely where it is or sounds like to me

[85cHeavyMetalBogger]

I know its already jacked up. the multi function switch that is. but never had this problem and the mfs has been messed up for a while now.

[ProGrade]

High beams don't work either.  Could it be a short in the multi-function switch? 

unplug the multi function switch and try jumpering the harness to verify the switch.