Mitsubishi: Eagle Talon, keeps killing Alternator & Battery

I had a 1991 Eagle Talon, I sold to a Co-Worker, (big mistake) anyway,
when I bought the car it needed an alternator and a battery, so I
changed them out, well my co-worker has called me twice now and said
that the alternator and battery were bad again, so I exchanged them
and replaced it, now she tells me they are bad again, she took it to a
dealer, she also said the seat belts have stopped working. It sounds
like an electrical problem to me, but I don’t know, has anyone had
this problem and if so what was done to rectify the problem? PLEASE
HELP

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vaneck34 wrote: 
Has somebody checked the "sense" lead in the battery/alternator circuit,
for opens.
Mitsubishi alternators have an input lead marked as "S". this monitors
the battery voltage for the regulator (in the alternator).
If the "S" input "sees" a fully charged battery, it turns off the
alternator output, if it sees a lower voltage than 13.8 volts it turns
on the alternator so as to charge the battery. If this wire is open or
has a corroded connector on it the battery voltage will be read as less
than 13.8 volts, and the alternator will turn on, thus over charging,
and eventually killing the battery.