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Think mine is starting to do same thing. Mine will only lose voltage when slowing down to a stop sign or stop light. It seems to do it more in the cold. I have even lost power steering when turning at slow speeds a few times. I can hear what seems to sound like a pully slipping or bearing going out. When I accelerate voltage returns and stays normal. Like you I'm leaning toward a bad belt tensioner. I do have a new alternator. Have you had any luck??
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