(ET) E12S and a curtis controller??

[Dave & Debbie Barden <daveb seanet com>]

I just acquired an E15 that's been pretty thoroughly updated with a new 
motor, 
curtis 1204 controller, contactors etc etc.  

I want to do the same mods to my E12S which I think has a compound series 
motor??  The fella I bought the E15 from doesn't think that motor will 
work 
with a curtis controler.  Does anyone on the list know if that's true and 
if so 
why?

thanks,
dave 
seattle
E12S
E15mod