While the alternator does impart some load on the engine, it is relatively small. Even when fully loaded against it's capabilities. We're talking a couple HP is all. Much less than you see with a mechanical fan for instance, or even the water pump itself.
That's not a meaningful contributor to heat generation of the engine, but if you're thinking about switching to electric fans, the alternator does need to be up to the task. As you point out, you're going to be hard pressed to have your factory 60amp alternator power your lights, AC compress, blower motor, stereo AND an electric fan. An upgrade will be needed.
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-Jason
1969 Pontiac Firebird
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