Specifications
'A'Circuit Regulator
When you have an "A" circuit type voltage regulator this means battery voltage is sent directly to one brush while the voltage regulator controls the field strength by varying the ground to the other brush.
It does not matter which wire from the slipring/brush goes to the regulator field connection* and which has the battery voltage connected, you can swap them around.
A great way to remember is A is for AFTER.
* In an external regulator application, in an internal regulator application this is usually restricted by the physical connections of the regulator
Some brush holders will restrict the polarity due to physical mountings and connections
'B' Circuit Regulator
When you have a "B" circuit type voltage regulator this means one of the brushes is connected to ground permanently. The voltage regulator controls the positive voltage to the other brush varying the field strength.
It does not matter which wire from the slipring/brush goes to the regulator field connection* and which has the ground connected, you can swap them around.
A great way to remember is B is for BEFORE.
* In an external regulator application, in an internal regulator application this is usually restricted by the physical connections of the regulator
Some brush holders will restrict the polarity due to physical mountings and connections
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