Ok I have a 96 GT with a manual transmission. I let the battery die on accident cause I left the dome light on. It was a fairly old battery so I went and bought a brand new one. I put it in and got power to everything but when I went to start it it completely shut down, I had nothing. I figured it was the battery and traded for a new one. This time the car started up perfectly. It did about 3 good starts over the course of 2 days. Today I went and drove it around and turned it off. Not even five minutes later it did the same thing to me. Gave me power to everything but when I went to start it it went dead. Please what could this be and how do I fix it!? Thanks in advance!!