Headlights are not bright?

This is a voltage issue and not a bulb issue. So let's do two things. First test the battery using this guide:

https://www.2carpros.com/articles/car-battery-load-test

Then test the alternator using this guide:

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Then we need to inspect the wiring for the battery including the terminals and make sure they are clean and tight.

https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

Then we need to make sure we test the grounds for the headlamps if all else checks out but I suspect we will find something with this. Let us know what you find. Thanks