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Car gradually loses voltage while driving.


I have a new alternator, voltage regulator, optima battery and all of the ground are good. When I first start my car I get about 14.4 after I drive the car for about 30-45 min the voltage starts to gradually drop to about 13.0. If I park the car for an hour or two and start it I get 14.4 but it will start to drop again. Does anyone have any ideas on what I can check or any thing I can do on the wiring?
 
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