Ned, et al.
I have the same Curtis 1510 type controller (1510A-5201, 1510A-5202, 1510A-5251, 1510A-5250, 1510-5251, 1510-5201, 1510-5202, 1510-5250 ) and sepex motor (my motor is ADC EJ4-4001; the GE motors from the Club Car Precedent IQ should also work). It took me quite a while to find a sufficient wiring diagram online. Once found, I took some time to create a new diagram that eliminates all the unnecessary, golf-cart-specific elements. The result is a fairly simple harness that allows this motor and controller to be used in anything.
A JPG of the diagram:
A PDF of the diagram: http://www.too-many-parts.com/misc/public_electrical_diagram_1510_simple.pdf
This thread: http://www.buggiesgonewild.com/electric ... oller.html
has been very helpful. I successfully got "into" my 1510A and read and modified its settings, to the limited degree that Curtis allows.