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Alternators need to spun to at least 800 RPMs to get any amps out of them.
Only reason I know this is I had a car that wouldn't charge at idle once. The alt wasnt under driven at all and was a beefy AC/delco 95amp unit. The problem is the car was idling at about 200-250RPM.
I conneced an amp meter in serries with the alt and was getting nothing, then conneced a tachometer to a spark plug wire and it would barely read.
Normally alts run at 3x crank speed, most of the time when you underdrive them you turn them at 2x crank speed and then there is "race underdrive" which turns the alt closer to 1 to 1 or 1.5x crank speed.
Most of the A/C clutches I have seen would put an alt close to a "race underdrive" state of operation.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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