1992 Sentra Charging problem?

First off

1992 nissan sentra 4dr automatic 130k miles

first I will start by saying my car died a few months back, it sputtered and came to a complete stop.
We figured out, or thought that it was the fuel filter, fixed that, car ran fine for a while.

last week, however, my car died, radio turns off, battery light, and ebrake light pop on. Throw a jump on it, take it to autozone, replace the battery. Runs for a few days, dies again. Alternator tests bad. Ok replace it with a rebulit one.

not 2 days later, it dies again same thing, radio turns itself off, dash lights pop on, headlights turn off. Jump it take it to autozone, low and behold the alternator tests bad again. Fine. Get another one put it.

had to tune up the car so here is what was fixed:

spark plugs,
dist cap
rotor
battery
alternator
fuel filter
oil
oil gasket top and bottom (was leaking)
leaking gas line
cleaned ignition switch

everything runs fine, or so I think until I drove today, but today, radio turns off, the battery light and ebrake flash periodically, what did we miss?

im afraid its going to die again and want to know if anyone has any suggestions?

thanks

josh.