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Do I need a capacitor or not? My lights dim when the bass hits. I've been told the only thing to do is get a bigger altenator but I just didn't want to go to the trouble or expense. I thought a capacitor would help this problem and also relieve some stress on the altenator. If a capacitor won't help me, can you tell what it is they are suppose to do. Thanks

 
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I'd go ahead and get the capacitor. Adding more things to your electrical system only adds more strain to your alternator. (I think!)

 
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Minor dimming is no prob.. a cap will take care of it if it's annoying you..if your getting some major diming.. a new alternator is the way to go