In all the years of chasing alternator whine in aircraft audio systems,
it sounded to me that it is at a couple of Khz.

Jon,

If the engine is turning 2600 RPM, that is 43 revs per sec. The pulleys
on the alternator have a ratio of about 4:1, so that would make the
alternator spin at about 173 revs per sec, or 173Hz. That would make
the alternator whine (assuming no bad diodes) of 1038Hz.

I should alter the sinsoidal current sources to have a freq of 173Hz,
instead of the 500Hz I used.

btw- for the electrical geeks out there, you are familiar with LTSpice,
arent you? If not, go look at www.linear.com and get a download. Best
Spice implemenation out there, and it is FREE!