[Excaliber]

The "theory" is that you would need or have to run all the systems at one time for any given length of time. If so, then yes, you will need more power. Is sounds like Rick has been there with this worst case scenario. All three fans, at night, with high beams on, in town, at low rpm (for an extended period of time), two fuel pumps clicking away, underdrive pulleys and a high amp draw ignition system.

If you at cruising speed on the highway you would not need three fans, or any for that matter. If your in town running at low rpm (with undersize pulleys) you wouldn't be running high beams. Hardly any of us are running two fuel pumps at the same time. While this scenairo could play out, I think it is highly unlikely for most of us.

In Xaviers case, based on his other thread, I think a far more likely scenario is that something is fundamentally wrong with his charging system or elecrical system. Changing the alternator out to a 100 amp or more I do not believe is warranted until further diagnosis rules out the 75 amp he is currently running.