How big alternator (84 K5 Diesel)

[botboy]

I'm curious how big the alternator is on my '84 K5, 6.2 diesel, 700r4, it appears stock or stock replacement, PO didn't say it had ever been replaced so it may very well be factory.

I'm curious because my '72 had a factory 63 amp externally regulated POS and it sucked, fixed several problems when I replaced it with a 105 amp model from a '93 burb (swapped pulleys), and this K5 usually gets the inverter I use to run my laptop to start screeching about low voltage if it sits at idle for too long, and I would like to change that. I also think that with dual batteries (and I'm considering adding a third for glow-plugs only during the winter) I should probably have a better charging system for the cold weather.