The headlamps on my 98 Blazer quit working one day last week when I started it in the morning. The parking lights, tail lights, and fog lamps work fine. The head lamps do not work when manually turning the headlamp switch on either. All fuses appear good. Instrument cluster lights work fine also. Am going to test high beams now after searching forum, any suggestions in the mean time? Thanks!

Manually turn on the headlamps, if the high beams, (inner bulbs) work, switch back to low beam and check for voltage and ground at both of the low beam, (outer) sockets. Post your results.