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Low voltage light usually comes on because alternator output is low or none. Put a volt meter across battery terminals, with car off, voltage should be around 12.5 or so, now start car it should jump to 13.8-14+ volts. If voltage doesnt jump then the alternator or votlage regulator are likely bad.

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Q: What causes a low voltage light to come on in a 1987 Plymouth Voyager?
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