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It means that the voltage is going up as the alternator spins faster.

4 posibilities;

1 Your battery is dying and the alternator is working harder to charge it when you accelerate. The lights are comming up to full brightness.

2 You have a bad connection at the battery terminals or frame ground and the battery can't hold the voltage down. The lights are receiving too much voltage and are more likely to fail.

3 The voltage regulator on the alternator is failing and overcharging the battery. The lights are receiving too much voltage and are more likely to fail.

4 The battery needs water. The lights are receiving too much voltage and are more likely to fail.

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Q: Why would dashlights brighten upon acceleration?
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