Headlight problem

[1997chevydriver]

Housings aren't terrible...when I pull the truck up to a wall or my garage door...and turn on the lights... there is no change whatsoever in intensity. Don't mean to beat this to death but it's getting darker in both morning and evenings and I need to get this sorted out.

Thanks for all the help this far!

With you saying no change i think the resistor went bad but I'd output is that poor start with what baron said.

Sent from somewhere in MN