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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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