I have been trying to figure out why i cant keep my battery charged. i have replaced the altenator and the battery. 3 altenators and 1 battery. ran out of ideas. anybody have any???

 

Do you have a hood light, trunk light or something like that on? They can drain a battery overnight.

 

Is the battery light ON?
or you mean the battery goes dead over night? Might want to run a Parasitic draw test if it goes dead over night. You can easily find accurate instruction for this Test on Google or Youtube. Hook up amp meter and start pulling fuse.
If you want to know if you got a bad battery, Disconnect the battery for one night, see if it dies the next morning.

You have any aftermarket accessory such as alarms or Audio system?
also, is the battery Terminal cables clean? show any sign of corossion?