[otto888man]

Have you checked the bulbs with a multimeter for continuity? Sometimes they look good but its broken to where its hard to see. Be sure you when you reinstall the new bulb that your hands are clean & grease free. If you don't it will affect the lens clarity. If you can also verify if you are getting voltage at the terminals. Let me know.

 

[Carbuff2]

Just change both bulbs.

These are dual-filament bulbs so they might light up (dimmer) when the lights are on.