Need help with Westinghouse DC generator

[Rance]

I've got an OLD Westinghouse 40 VDC 5A generator.  Type FK, Series AZ, Style 1178609-B, Compound winding, 2800 RPM.  Originally it was the DC power source for a 1950s era IBM punch card reader.   I'd like to use it for low head hydro (Banki) but there's zero info about it on the web.  Basically I need to know how to wire it.  There's one black wire and two whites coming out of it.  Any ideas?  Does this critter need excitation capacitors, and if so, what size?  Any thoughts will be appreciated!   Thanks

Attached are a couple of pics, per your wise suggestion.   

 Markings on terminals are:

TERMINAL     MARKING   CONNECTION
Top                  S1  F1    capped, unconnected
Upper middle   S2          had a white wire on it
Center             A1          no terminal present
Lower middle   A2          had a white wire on it
Bottom            F2  L2     had a black wire on it

[Bruce S]

Welcome to the Forum!

IF you can please post pics of the unit's wires and any possible internal connections, etc.
Pics can tell us bunch!

Thanks
Bruce S

[Henry]

What it is it?

[Rance]

Thanks for your interest Henry.  Got my problem sorted out a while back thanks to help from a different board.  Basically trial and error. I put a motor on it to spin it then just tried different combinations of connections.  With only three terminals not that many combinations!  Found a combination that worked and presto, 40 VDC!

[Henry]

Clear. Thank you.