It's not uncommon for there to be a significant voltage drop in the headlight wiring of diesel class As. Too many feet of wiring that's undersized for the distance. Measure the voltage at the light. Best if can leave the bulbs plugged in. Might not be possible depending on the headlight connection. If your voltage is low, you'll need to run a larger power wire to the front and use the existing switch and wire to activate a relay. That way you by pass all the wires going up to the dash, through the switch and to the headlights. If you can't find an LED bulb that works in your headlights, you can use HIDs in the low beam. Looks like you have projector headlights so your low beam fixture should have a built-in horizontal cut-off baffle.
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Tom M. 1998 Safari Serengeti 3706,
300HP Cat 3126 Allison 3060, 600 watts of Solar.
Fisher and Paykel Residential refrigerator
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