97 Tahoe missing low beam

I have a problem with missing low beam.
The DRL (driving lights) and high beams are working perfectly.
I have trided to change light switch but that did not solve
problem.
I suspect a bad connection somewhere, but I do not have a wiring diagram for this.
Is there anybody who can give me a tip, where to look?

Regards
Egil

check wiring at the end of dimmer switch on steering calumn