Using probability logic, bulbs are probably fine; they probably did not both burn out at the same time. Dimmer switches rarely fail. Most probable and 1st place I would, look is low beam connection from dimmer to where the wire splits to go to left and right headlights. Good chance a wiggle of the connection of the wire at the dimmer may make lights illuminate.
For something like this you can get by with a simple circuit tester if you have one rather than a multimeter.
http://www.autozone.com/autozone/ac...ster/_/N-26lp?itemIdentifier=222515_0_0_Good Luck
Mikey