My 1989 gmc serra the head lights don't light the road to well is there something I can do ? different type of bulb

Dull head lights cab be from several things
1-bad reflectors behind the bulbs --any yellowing, rusting or dull reflector surfaces -- replace head light assemblies
2 badly aligned head lights-- beams shining off into space instead of on the road. --- have an alignment done on the lights
3 wet roads do not reflect head lights properly so it appears that the lights are not working well--- not much to do. the light reflects forward of the wet surface and not back to the driver
4 only one head light or no main beams and running on low beams only--- check light operation and check light control module for operation

You can pull the truck three four feet away from a wall or garage door and see were the lights are hitting, using a York or a Phillips hear adjust the screws on the to and side of each head lamp. If not bright enough adjust and replace