[ERA_Evil]

a couple weeks ago, my 87 cabriolet, which was made from fuel injection to a carburetor system, started to go bad. the problem is that i turn off the car and it wont start again due to the battery going dry. i jump start it, it works fine rune great, everythings good, but it wont charge the battery. something is draining it, i went through 3 batteris, the last one an optima red top. i put it in, started the car fine, and standing still, i just watch the volt meter star at 13v, and just start going down till like 9v. i changed the meter, for a new one, i changed the alts regulator, i checked for loose wiring at any point in the ignition, in the stereo system, the wiring to the amps, all live wires, everything i could think of and still nothing. if the battery is charged, it drains it while running or standing still. i have no idea what the problem could be. any help really appreciated. i hate having my car in the garage and not being able to use it. what other wires are "live"? so i can check again

and i also have a capacitor with a digital voltage meter so i can keep an eye on the volts, and it always goes down. please help!!!