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Sounds like it has possibly got a defective multifunction switch,which is part of the turnsignal lever/high beam lever switch. Aside from physically diagnosing the circuit I would say replacing the multifunction switch may take care of your problem.
The headlight switch gets power for the headlights from a 50amp fuse. The fuse powers the headlight switch then the dimmer switch breaks for high and low beams. So if the high beams work, the problem may be with the dimmer switch. The dimmer switch is made into the turn signal switch on the column. You would need to check the low and high beam circuits at the switch for power.
These trucks are known for bad multifuction switches. the switch that i talk of is the signal switch , the handle is the switch, it bolts to side of steering column . this switch controls the signals and the headlights and high /low beams. the other thing is the headlight switch connector, the connector some times goes bad and starts to melt or just comes out of the connector. you will need to remove the cover to steering column, the screws are located under the bottom cover in holes. remove cover and check connector and then test for power if you have power going into switch but not coming out then switch is bad.
the last thing is to make sure the bulbs are good , make sure the headlight bulbs are good , and also the driving light bulbs, test for power at the connectors to those lights to. You will need to do a little testing to find the problem.
try the lights with the tilt wheel in the up position. If the low beam works then, a wire has pulled out of the connector on the mutipurpose switch inside the steering column. remove the covers behind the steering wheel on the column and there is a large multi wire plug with many wires. it should be obvious which wire has pulled out or broken.
pull on the signal lever toward you (ceter position). the signal lever controls the head lights either high beam or low beam. if you pull on the signal lever toward you again, you will have high beam temporarily. and if you push the signal lever towards the front, you will have the high beam locked.
might not be. high beam is directly connected and controlled by the switch in the steering column. that would be a great place to start trouble shooting. i have found a lot of problems from contacts over heating and melting the plstic holders on those switches.