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So my 2005 Chrysler 300 battery light keeps coming on and then off every few days, and I just recently replaced the alternator, the battery has about 13.78v when running and all the alternator connections are tight and the headlights keep going dim and bright again and I have no idea what is wrong with it. If anyone knows anything about it lmk plz
 

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2006 CRD Touring
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With engine running you should have 14.4V, so your replacement alternator could be the problem. Was the alternator brand new or re-con? Check that the field control wire has been re-connected, as this is sometimes overlooked when replacing alternator. It is also possible that your battery is defective. With engine stopped, a fully charged battery should have 12.6V on light load.
 
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