DaveC wrote:


How would you go about identifying the windings? Maybe use a Variac to
input voltage to each of the windings then measure the output of the
others?

Yup, put a small voltage on one winding, and see if you get a much
larger voltage on another. If so, you can tell which is the H and
which is the low voltage one. Once you have identified the high and
low voltage windings, you can put them in series to determine
which way the phasing goes. If you get, say 50 V out of each of
two windings, and then put them in series and get zero, you have them
phased backwards. Reverse one winding, and you should get 100 V.

Jon