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2000 Chevrolet 2500 - Lights issue

Headlights work on high beam but not on low

Do you have separate bulbs for high beams and low beams? Have you checked the bulbs?

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Pyrolord is on the right track. My Highlander has this issue when one of the daytime running lights is out. The bulbs are all interconnected. Look for a bulb out other than the ones you suspect. Circle back if you find the issue.

Within a couple days of finding out one of my headlights’ low beams was out, the other one went out, too. Two new bulbs took care of it.

A faulty multifunction switch can cause the low beams not to function.

https://www.rockauto.com/en/moreinfo.php?pk=935437&cc=1358478&jsn=483

Has someone installed aftermarket HID headlights in it?

Replace the bulbs on both side