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The battery light will come on when there is a charging fault, 16 volts is too high. It should be between 13.8 and 14.2 at idle off the back of the alternator. If it is infact charging at 16v then the regulator int he alternator must not be operating correctly. Get your multimeter and test off the back of the alternator on the main power wire and earth the other lead with the engine running. The light may be coming on because its over charging?

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