Is my battery junk?

Well the problem started the other night while driving, when coming to a stop the battery light and the Ebrake light came on. It didn't die or anything, made it home, it would start but with the bat. Light wouldnt shut off and the battery meter was the lowest i'd seen. So we unhooked the battery while running to see if our alternator was the problem and. It died. So then we got a new one and it would start, but then unhooked the terminals just to see and. It died.

Then we changed the voltage regulator thinking that was it and still would die when we unhooked the battery. So I'm figuring a fusible link but since the Ebrake light came on at the same time and it won't turn off either, maybe there's some link that is in common with those two light being on. I dunno, so any ideas would be helpful. Thank you

Ok I relayed that message to my hubby, but what will that mean and how would that work and is there any way of doing that, that could mess something up?(Sorry I'm just a girl).
K- also I've been researching and stuff and on a forum there was this guy w/ similar prob, multiple alternators from kragon (the rebuilt ones) and until he got one from Toyota (a real one) was he able to fix his problem. Could it still be the alternator because we got our rebuilt one from kragon too?