Ok, get this! I posted not too long ago that my license plate lights refused to come on after I changed the bulbs. It was suggested that I remove some of the corrosion on the contacts and the lights should work. So I picked the light on the left side closest to the trunk bracket with the wiring attached to it. I unscrewed the cover, removed the new bulb, scraped the contacts clean with my screwdriver, replaced the bulb, switched the headlight switch to "on", and what happened? Both license plate lights lit up! I never even touched the righthand one. It appears my problem is solved and I'm glad, but why is it solved? Are these lights wired in series and I just happened to pick the one that was acting up in the first place? Now I'm really curious...