Lister HA2 coupled with mystery Generator

[Ssn571]

I recently inherited a project- a HA2 coupled with a mystery generator. The generator has no tags on it except for "B6961CB" stamped on the case. It has a mess of T1-T12 labeled wires that appear to be wired to single phase. I need help identifying the generator end. I was told it was a 12kW. I flashed the field on it and the output is 2.2 VAC currently but this is all new to me.