If there are two big post/studs out the case, the one is often labeled A or ARM or GEN or G while the other (sometimes slightly smaller) is labeled FLD or F. Most are labeled ARM and FLD or at least A and F instead of Gen which is seen on many Voltage regulators.
NOTE some Ford products are B Charging systems
The output is across the ARM/GEN A or G and case frame Ground while the current passing through the Field (F or FLD) windings regulates the output.
If you run my Troubleshooting Procedure below it will describe how to Polarize and also has a test to determine if non charging is due to a faulty Generator versus a faulty Voltage Regulator. It also has a Motor Test which can provide insight if the genny is good or not.........
My procedure is for Class A charging systems ONLY and isnt exact for Class B's
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