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Lacking a schematic but having a knowledge of similar circuits in other vehicles I would suggest that starting at the switch or relay, whichever feeds the headlights with switch on, you need to find the high resistance in the circuit if the grounds are good. With the engine running and the connectors off the bulbs your voltage should be within a few 10ths of a volt of the voltage measured across the chassis battery approximately 13-15v.If all tests show good ground ,supply voltage within specs, and corrosion free connections at bulbs, new bulbs should correct this condition. Halogen bulbs can lose brightness over time. Also check reflective surfaces within headlamp assemblies . I have found bad grounds along steel supporting structure under dash behind grill area relating to wipers on my Tropi-cal ,possible that this area could be causing your concern. Modules cannot develop high resistance internally through semi-conductor material only at connections to the modules and other components along these circuits
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Fred & Darla 2000 Tropi-cal and 2016 Chevy Sonic toad
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Linear Mode
