From our friends over at ASEC

Undercover car, used in Sudbury Ontario (way up in nowhere) for 4 years, in extreme winter conditions, salt, sand, and snow.
My door sensors no longer work (interior lights no longer come on when I open my doors) cause they completely corroaded away.. copper.. just turns to green powder.
About a month or so ago, I bought new SilverStarâ„¢ headlights and put one in, gave it a try, and... ohmy.gif what!? nothing! Not on EITHER of the lights!? So WTF I put my stock one back in and... BOOM nothing! UH OH
I was mad cause WHY!? Hhehe, HOW!? WHY? The fuse was still good. The switch was still good. The RELAY in the fuse box... was still good! The WIRING looked pretty good. WHAT caused this!? The bulbs were still good!
No-one could figure it out. So today when I had'r in the shop getting some work done, I had them look into it. It appears that there's a relay UNDERNEATH the car, near the horn on the front lower left of the car (in front of the wheel for those who don't know).
The wires going in were completely, COMPLETELY corroaded. What a silly design! The wires were unprotected, and I mean that's the bottom of the car for christ sakes! Suffice to say, it's now apparent that when I was swapping the bulb I must have tugged that wire, and in doing so made the greenpowder, fall apart.. thusly losing the connection.
THe relay was all messed up too unfortunately, so I needed a new one $50. It cost me $75/hr and $50... to have my high beams work again, boy if I don't feel like a blond (and it took one hour).
SO FOR THOSE of you who may be as unlucky with your highbeams as me, let it be known.. check the relay UNDER the car as well, probably the issue.
- James