Your referring to a regulator that has three terminals leads me to believe that your tractor originally was equipped a generator system instead of the 10DN alternator. The regulator terminals will be screw type rather that flat blade type.
The 10DN alternator would have used a four flat bladed terminal regulator. The 10DN alternator has the spade terminals coming out the back. The terminals are labeled R and F.
Since you also referred to numbers 1 and 2 I am going to assume that the alternator you have is a 10SI. The 10SI can be identified by the spade terminals coming out the side at the back. The 10SI has an internal regulator.
If you indeed have a 10SI alternator all you need to do is remove the blue wire from the regulator and connect it to a switched source of power. It should have either a resistor or light in the circuit.
The excite circuit will work with just a direct 12 volt source feeding it but if the alternator output circuit wire should become open or disconnected from the alternator the charging current will flow through it. The wire is too small to carry that much current. The resistor, or light acting as a resistor, will protect the wiring.
This post was edited by Owen Aaland at 12:11:36 09/20/10.
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