its an 85 gt. 3g alternator, dual electric fans with controller, holley ignition and electric fuel pump. that's it as for the electrical parts besides the obvious headlights and such. problem is, even with a new battery, you can start the car, let it run and then cut it off. sit for a few minutes and it will start right back up. do this again and bam, the battery doesn't have enough juice to start it. does not matter if the car runs 30 minutes or 3, on the 3rd try, the battery will be dead. alternator has been tested, puts out 14.4 volts at idle. 3 different new batteries have been tried as well. all new cables as well. positive cable is 2 gauge and have run 2 grounds. one is 4 gauge going to block and other is 2 gauge going to the chassis. starter is new as well but is one that has the solenoid on it, not on the firewall. I am lost now as to why its doing this. any and all suggestions are welcome.. thanks