More regen ?'s

[cowtown@tfz.net]

Following Lee's discussion of a regen circuit I submitted, I contemplated
how one could eliminate the controller and still have "control": could you 
place a contactor from S1 to A2, the 400amp/400volt diode from A2 to 
traction pack negative, and use a small 6-12V (or smaller?) PWM controller (with  
appropriate battery) to run the field?
The pot for the field controller could be a squeeze trigger on the shift 
knob (since you'd have to do some shifting to keep the rpm's on the high 
side to get maximum effect), and powering it up could cut the power to the contactors. If there is any way this might work, what amperage is needed for the field? A posting a few 
months back mentioned a 12V/35amp PWM for sale on the web...would this do? As an example, if your Prestolite 4001 is
going 4500rpm in 3rd gear, how many amps have to go through the field to 
give a strong (say, 1/2 g?) braking effect?