ok i bought a 93 deville on the 25th, the guy tells me all it needs is a battery so i get a new batt. put it in it fires up i drove it home,it sat at my house for 2 days, i go outside to start the car it statrs no prob, next day i go to start it nothing it sounds like it wants to start but wont fully turn on, i take the batt. to autozone to test it its only holding 40% charge so i get new batt. same thing will not start batt is constantly going out, seems like somethings draining it, tested the alternaor its good,only other thing i can think of is the factory security system