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Message: <blockquote data-quote="AlterEgo99" data-source="post: 5935342" data-attributes="member: 610253">Personally, when I see questions about lights dimming and batteries, one should be think about the alternator.  The only time your battery is going to be used to power your equipment is when your vehicle is turned off.  When the engine is running, you are getting your power directly from the alternator and its amp output is what is causing your lights to dim.The amp rating on your stock alternator may be adequate for the electrical load of the vehicle from the factory, but once you start adding amps, especially BIG amps, you are going to need more power.  You should seriously look into a high output alternator.</blockquote>

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