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I have mine in a deuce I don't think you'll get voltage without a battery I think it's a built in safety feature to protect the alternator from being damaged. I have mine in my service box in a plastic boat battery box I ran a a 10 or 12 Gage wire from it to the battery. Then powered my stereo...

You can charge a third battery with it I wouldn't run a stereo off of just the wire I think it has a voltage sensor in it so it won't read a charge voltage unless a Battery is hooked up to it.