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3rd wire is prolly a ground.
Don't connect the third wire to ground. That's your idiot light. If I'm correct, that wire has a +12 volts on it. It goes to the idiot light and gets hooked to a +12 volts there. When your alternator stops working, the third wire becomes the ground and the light lights.
If you connect that third wire (+12volts) to ground, you'll let smoke out somewhere.
Hope you read this in time.