The resistor is designed to power only a certain number of lamps, at reduced brightness, in the "DIM" position. If you have more lamps hooked to that terminal than it was designed for it will get RED hot. It is probably only designed to power 2 headlamps. Connect ONLY your 2 main headlamps to that terminal, and power the rest from a terminal that is shut "OFF" when the switch is in the "DIM" position. That way, the only two forward-facing lamps that will be powered up in the "DIM" position will be at reduced brightness (for meeting oncoming traffic). (Rear-facing clear lamps most likely are supposed to be "OFF" in this position.) If the switch is not heavy-duty enough to power all the other lamps that are "ON" in the "BRIGHT" position, use a relay to switch the current to the main "work lights". I have a 6030 schematic at the shop. If it includes the cab lights, I could scan it and email it to you. I'll look tomorrow.
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