Marcus; There is more to this story. Just so all info is considered, here is another piece of the problem in the other thread.
http://986forum.com/forums/performance-technical-chat/61933-headlight-questions.html
http://986forum.com/forums/general-discussions/61951-help-battery-issues.html
Don't know how a massive current draw by the headlights could not blow a fuse, but there seems to be a connection.