There is nothing technical or fancy with the headlamp circuit on this truck, no lighting control modules or relays. The only exception would be if the truck has OEM daytime running lamps, if this truck has DRL's the low circuit simply passes through the non activated DRL relay (w/headlamp switch on). If the DRL relay is activated or stuck on you should still see the low beam lamps come on but the DRL resister would make the lamps glow dimmer than normal.
There is a main fuse (#13, 30a under hood) feeding the headlamp switch for controls, multi-function switch gets input from H/L switch, then wire leaves the multi-function switch and goes to the fuse box (under hood), this circuit branches into 2 individual wires before the fuse box and each low beam headlamp has its own fuse (#9, 10a LH & #11, 10a RH under hood). The circuits leave the fuse box on individual wires to the bulbs.
If you have a test light or volt meter then check these wires, There is a Red/Yellow wire going into multi-function switch, this should have power with the headlamp switch on. For low beams there is a Red/Black wire leaving the switch to the fuses for the bulbs. For high beams or "flash to pass" the Grey/Orange wire should have power leaving the switch. Also the #9 and #11 fuses in under hood fuse box should have power when low beams are selected.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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