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All Army vehicles that have the same circuit, like the light switch to dimmer switch feed # 16 will muse the same circuit number to identify it. As then only difference in the lighting circuits on the common MVs raging from 1/4t to 10t is the length of the wires dictated by then length of the...

Most often, as noted in previous post, these lighting and electrical gremlins in older vehicles frequently involve bad grounds. Or you can be the Army and put a boatload of FMTVs on the broad ocean for a month going to Iraq and find out most of the electronics are fubar from salt air corroded...

From the sound of it, when the service drive function ( 2 clicks to the right of "off") is lit, the lights on the back of the truck and the dashboard work. Nothing on the front in either high nor low beam ? Parking lights in front will remain off unless "park" setting on lower left lever is...

Power up to wires 16 or 17 behind the bulbs ? There will only be power to one of these two circuits depending on the dimmer switch If no power, then work your way down the circuit to the 3 lever switch and see if you find any. If parking lights work, you have power as far as the switch ? Do...

Power at dimmer switch ? if both high and low beams are out at the same time the problem likely lays elsewhere than bulbs. I gather from post 15 you understand the three lever light switch.