Actually, the fans DO put extra strain on the alternator because it has to work harder to keep the battery charged. But that is really irrelevant anyway because your alternator isn't going to crash from running efans when people run 1000 watt stereos on stock alternators. I've done a lot of study on the charging systems since getting into car audio. In my 69 I run a 240 amp (180 at idle), my regular battery, and a special audio battery (Batcap 2000).
The main thing is, if your voltage isn't dropping to extremes and the headlights don't dim, you're safe.
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