The headlights on my Tahoe are dim too. It's also a 1999. I replaced my bulbs with Silverstar's but it was still dim. I used Mequiar's Headlight kit to polish off the yellowing and oxidized headlight's and it really made them look good but they are still not bright. They look bright but the light hitting the road is still weak. It's because the inside of my headlights are a little bit cloudy still. The heat damage from the bulb made the insides cloudy and the light is still weak on the road at night. That's all I can do unless I replace the headlight assemblies. Much money and not super simple to do. I have very bright bulbs just cloudy housings that still don't allow the beam to fully shine through. I don't know if that is your issue but I hope this helps.
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