What I was telling you earlier is that you can buy a totally new wire harness that will handle the increased load. It basically hooks up to the battery for 12V and uses the current connector only as a trigger to turn on. The wiring is made from a thicker gauge cable for increased capacity and less resistance. I can't remember where I saw them advertised, but I would not run a 100W bulb on the stock wiring.
If I find that site, I'll post it up.
If you can find that harness i'd appreciate it.
Until then, i've got my stock wattage versions in the mail