My Gti Leaks

My Gti Leaks Behind The Drivers Side Door Onto The Rear Sets Floorboard As Well It Also Leaks From Somewherebehind The Rear Passenger Tail Light Fixture Into The Spare Tire Wheel Well. I Bought This 2001 Gti Glx Vr6 Used A Short While Ago But There Wasn't Alot Of Rain Until This Past Weekend And Before I Go Crazy With It I Was Wondering If Anyone Knew What The Deal Was. I've Checked The Car From From To Back And There Aren't Any Signs Of A Prior Car Accident. Plus The Passenger Driving Light Is Dimmer Then The Rear Drivers Side Light. Does Anyone Have Any Comments Or Suggestions???

If it has a sunroof clean the drains. The dim light probably has a poor ground.