Left headlight doesn’t light even when using good bulbs. Bulbs work in right side.
you need to check the connector for corrosion or burn marks. check the wiring for burnt area or breaks. and check to see if you have a separate fuse or relay for that side that could be bad…
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If continuing to have this problem, ask shop to measure voltage at the non-functioning headlight connector. It won’t ever light up if the correct voltage at the connector isn’t present. Caution: Some headlight systems in newer vehicle use a high voltage. If so, let shop do the test, not diy’er friendly.
The ballast for the LED may have failed.
Tester