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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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