[Big Bad Bob]

Patrick Turner wrote:
CAN BE VERY DANGEROUS unless one realizes that ****ing around
with transformers can easily kill you.

testing continuity with a battery and a flashlight bulb, using fingers to
hold wires on the battery, can be similarly 'energizing'. Anyone say
'signal generator and/or o-scope' ? A lot of scopes (or older ones, anyway)
have a calibrated voltage output (like 1V p-p) with built-in overload
protection that you could theoretically apply to ANY winding, then use the
scope to (carefully) measure the signal at the various points, with the
assumption that the scope input has proper overload protection as well,
which it should. 1V p-p on a primary for an OT might give you 10s of
millivolts on the secondary but that's ok for a decent scope. You'll get
really accurate measurements, too.