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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner past midnight.
Can you outline your question a little better, this is what I got.
I know it is a 2004 but I do not know the make and model vehicle.
#2 is the blower speed what is going up and down? Is it changing blower speed or just barely changing? While driving at night do the headlights get brighter/dimmer?
#1 Do you own a volt meter? Are you planning to replace the glass yourself?
#3 I am not good at diagnosing convertible top issues not in person but I can offer what I feel like could be wrong.