The regulator you have requires only one wire to make it work. It also has provision for an additional wire to use the indicator light.
The B+ should be connected to the battery terminal on the alternator and the B- to the ground terminal. It should work without a wire on the light terminal. Like the one wire 10SI alternators it may take a high rpm to get it to start to charge. If it doesn't start to charge at high idle you can try putting battery voltage on the light terminal.
Single wire alternators depend on residual magnetism in the rotor to provide enough current to enable the field coil in the rotor to start to work. When they sit for a long time they can lose enough residual magnetism that you have actually have to polarize them to get them to start to work. Putting voltage on the light terminal will do that since it is connected to the original R terminal on the alternator.
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