I have an old 1.5 kw ac generator which needs the feild re- energized, it's a type i've not seen before, with output ( 240/110 v ) off the rotor, via 4 brushes, and stator coils with a voltage regulator, whats the correct connections to re energize it with a 12v battery, and should i disconnect the regulator ?
------------ If the field resistance is high enough so only a few amperes flow (and this would be normal), you can "flash" the field as you indicate with a 12V battery. All that is needed is that you establish some residual magnetism. How is the field supplied? Could you give more information? The problem is that the field must be supplied from the AC through a rectifier that may be part of the regulator and the rectifier gives the same polarity. (It may be simply a matter of looking for + and - marks somewhere and the following would not be needed) I would suggest disconnecting the supply between the AC side and the regulator/field and with the generator not running, connect the battery across the field/regulator terminals so that a current flows- no current -reverse the battery. If you haven't an ammeter then a compass will do- put it over the wire- note the position, connect the battery and note any deflection which indicates current. otherwise, try it one way, reconnect normally, try it out. If it works-fine- otherwise repeat with the battery connection reversed.
However- can you give more information- even what wires go where?
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