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If the chargeing voltage is where it should be, and it is temperature dependant at that, you should not need to adjust it at all, even it seems a little bit higher than you might think. If the voltage is low, even compensated for hot weather, the winding of fine wire controls the voltage. The cutout relay is the heavy gauge wire wound coil. The voltage regulator is adjusted with the screw, but you need to know the air temp, and you need a volt meter calibrated into the realm of tenths, and preferably even hundreths (DVM's are this way). You should also have a carbon pile available to apply considerable load for testing. You also should have the temperatur compensation chart too. If voltage seems high, and air temp is around freezing and colder, the charging voltage will be around 14.5 volts, give or take. When air temps are cold, the battery is not being overcharged until you reach a point of around 15 volts. If operation seems erratic, check for a burned out resistor in the rgulator and external connections.
If there is a bad resistor, it is easiest to replace unit, unless you are trying to keep everything exactly as original.
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