1996 Dodge Ram • 120,000 miles

I am having problem with my headlights. About a year ago once in a while the headlights (only the headlights) and I would pull over to the side of the road, and wait for about 15 minutes and the lights would come on and everything would be fine for a period of time. Then about a month or so later it would happen again. Again I would pull over and wait and the lights would come on and things would be fine.
In the course of maybe one year it happened maybe 6-8 times and each time it would take longer for the lights to come on again. The last time it went out has been over 3 months ago and now I have no headlights. Everything else works fine.
What do you recommend as a process of elimination?
November 1, 2012.

Check fuses and relay in underhood fuse box and check grounds for headlights, make sure they are clean an dmake good contact.

Nov 1, 2012.