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Without testing the electrical circuit's for the headlamps we'd only be guessing . Looking at wiring diagrams an testing the circuit's with a DMM - digital multi- meter is the way to find the problem , not just replacing part's . Sound's like you know nothing of automotive electrical system's ,an testing . Suggest you take your vehicle to a qualified repair shop.
For the 1990 Chevrolet C1500 454ci = 7.4L V8 = "ss" = "big block"
Click on the the following: direct, Free Link. It has the Serpentine Belt Diagram for the 7.4L (454ci). I'm not sure what you want on the "wiring" part??
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