I didn't mean to jump on Amervo or anything, I was just having a bad day and took it personally.
When I have light problems, (what person doesn't at some time during his restoration problem), I usually do start with the simple stuff like checking bulbs, fuses, grounding, switches. Then when the simple stuff doesn't correct the problem, I typically will ... go to the forum!..heh.. Seriously, Id usually try to find the wire and back track it looking for a break, and then will dig out the multimeter to test it. He is right that most of the time, its the simple stuff thats usually the problem. But it doesn't hurt to have the wiring diagram and a multimeter handy in case its something worse.
Sorry for the grumbling yesterday...just blame it on pms.. (women say that, why can't I?)