What would cause a car that has a fully charged battery to do this? :::: I turn the key to ON and lights come on, radio works, fuel pump is heard coming on, everything seems fine. Then as soon as I turn the key to start the car, the starter clicks and then the car dies completely, like even if you put the key back to the ON position, you get nothing, no juice whatsoever. It is not the battery because I tried 3 different ones... also, after this happens, i can jump the battery from a different car, or use a charger and then i will be back in the same situation as when i started, where i have juice but then when i try to start it the whole car dies. HELP PLEASE....

 

Sounds like your battery terminals are corroded. Or you have a bad ground.

Try a wire brush on your terminals and check the ground wire from the battery to make sure it is tight. Mine ran to the alternator bracket. You could also wire brush where the ground wire is attached.

Good luck.