Depends upon the type of alt installed, ie, external or internal regulated.
If ext reg, the field excitation wire would have some, a couple of volts, depending upon load, to supply the field to produce the charging voltage required. Also, a quick field check would be to place a screwdriver perpendicular to the rear bearing and feel the magnetic draw against the screwdriver.
If int reg, sensing wire should have battery voltage on it. Also, the screwdriver trick works well.
As a last resort, one can take the alt/regulator to Advance Auto for a free checkout.
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