Hmm... that sounds discouraging.
An A/C electric clutch on the alternator would solve the problem. There are several at the Century Trading Company salvage yard in my town. Basically a junk yard, for anything metallic. They charge around $0.30 a pound for anything in there, so I could get one incredibly cheap. I assume they just run on 12V to engage them. If I could find a way to mount it to the alternator, it'd be very similar to MetroMPG's unbelted alternator experiment, except I'd still have my belt on. I could use my toggle switch to engage/disengage the clutch then.
I'll probably play around with the alternator a little more first and see if I can figure out some electrical solutions before I go with an A/C clutch.
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