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Randy's right on, though I wonder if you're going to add a bunch of stuff like a zillion-watt stereo with 52 in sub-woofers, etc. If so, then you might want to add a beefier alt.
There are a couple of routes doing this - I found the easiest was to install a 100 amp Denso alt out of a 940. It fits perfectly, and is a drop-in; it uses the same bracket basically, but mounted on the other side of the engine.
I got my alt from the junkyard, so it only cost $40, though I couldn't test it, obviously. Anyway, I'm teaching myself about cars using this Volvo, so I'm not a mechanical-type by any means. I did the switch in about 45 minutes, including jack-time, etc. If I can do it, you can do it too, with a minimum of effort, I'm sure.
As for the Bosch alts, there's a wide range available; the 240 came with either a 55 amp or 80 amp Bosch unit (the latter was used on A/C cars, I believe); the 740/940 cars have a 100 amp unit in the Turbos - either a Bosch that looks the same as the 200 series cars, or a the Denso.
People install the Denso for two reasons, generally - 1) It adds power for more accessories; 2) It's smaller than the Bosch, so makes it easier for the Turbo-loving types to use...
If you need more power than 100 amp (installing a two zillion-watt stereo?!) there are instructions on installing a GM 140 amp alt over at Turbobricks - be forewarned though, that it involves some amount of modifying the brackets and/or alternator to get it to fit. Those guys are pretty aggressive, so they don't sweat that stuff. I don't have the tools/space to do it, so I'm usually looking for a minimally invasive procedure... and a drop-in 100 amp alt fit that bill.
Best,
Lanval
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