Question about 1989 Toyota Pickup SR5

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Battery light comes on when I give it the gas and the voltage goes up. Battery and alternator have both been replaced. What could be the problem? It is in a 1989 Toyota Pickup. V6 3.0

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Make sure the wires are tight on the back of the alternator and the belt is tight. If they are, the alternator has a bad diode in it.

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