A closed voltage adjustment
With a dry cell and battery ammeter in series, connected to the regulator battery posts. Start the engine and gradually increase speed, observe the ammeter pointer on the tractor when the interceptors contact closure. If the ammeter pointer to the "+" direction swing, said closing high voltage, should weaken the spring tension; If the ammeter pointer to the "-" direction of the swing, then closed the voltage is low, it should increase the spring tension. So repeatedly adjusted until the ammeter pointer hardly swing interceptors contact closure, said closure voltage appropriate.
2, adjust the regulator values
With two batteries and battery ammeter in series, connected to the regulator battery posts. Start the engine, gradually increasing speed. When the regulator is operative to observe the ammeter pointer. If the ammeter pointer to the "+" direction swing, said the regulator value is high, should be reduced spring tension; If the ammeter pointer to the "-" direction of the swing, said the regulator value is low, you should increase the spring tension. This repeated adjustments, until the regulator work, ammeter pointer hardly swing, then the value of the appropriate regulator.
The principle of this method is to adjust: batteries connected in series with the battery, there is some potential, but certain voltage generator is issued, when the two would produce unequal current. The former potential is higher than the latter, the ammeter pointer to the "-" direction, otherwise the "+" direction. Only two potential almost equal, ammeter pointer just do not swing.