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Yes, When you reversed the wires it would let you know if the bulbs were ok as you were switching high beam to low beam. They should have lit up either way if good whether you were in low beam or high beam. Sounds like the bulbs are bad. Verify with a test light you have power to 17 and 18 one...

Most likely culprit is the floor mounted dimmer switch. It looks like and mounts like a civilian very common switch but it is 24v not 12v and has the military wiring connectors not a 3 wire slip on pigtail. Possible other cause is 2 burnt out headlights. Bulbs have 2 filaments. One can work and...