Warren Mohler

dimmer switch is located lower left side of column and as others have stated is rod operated very awkward to get to a magnetic socket is recommended for removing and replacing screws be sure to not over tighten if replacing switch but I doubt this is your problem many times I have seen both headlamps burn out at the same time so check this first if lamps are ok continue on checking for power and ground do this at the lamp plug I have been working on these jeeps and many others for over thirty years have never seen this dimmer switch go bad you stated you still have high beams so ground should be good check all wire harness from lamps rearward and all associated connecters for corrosion as far as I con remember there is no relay

a good way to find leaks, tape over air flow through vents on both sides of cab these are the black plastic vents behind both side windows roll up windows turn heater to high on vent position spray soapy water over cab to see where it blows bubbles I have found many water leaks like this in the past.