92 brougham Electrical problem

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1992 cadillac brougham 10,000 mile. 1 - battery light flashing allthe time 2 - turn signals light blinking faster than normal 3 - when i start the ignition the ac direct turn on so if i want to turn of i should press on off button 4 - fuel gage notwork properly always shows tank is full 5 - a/c blow cold/hot air but from beneath the dashboard vent only othe vents not blowing any air. Please anyone could help Thanks