HELP! Dead Battery on Type 44

[Adam Jansen]

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So I was driving home today and the low voltage light came on.
Shortly thereafter, the headlights dim and the car sputters.  Luckily I am =
able to get the car back to work and get a ride home.  Car is dead, little =
to no juice in a new battery

This happened a month or two back, I replace the voltage regulator (brushes=
 were down to almost nothing) with a new one from Parts Connection. I haven=
't driven the car in a while, but I pulled the alternator and took it in. T=
he tech at the local parts store said the alternator was good, but I don't =
have a lot of faith in his abilities.

What could be causing this?  Any ideas I can chase down to check?

Thanks
Adam
Oly, WA
87 5KCSQ