If you didn't correctly hook up the alternator, it will not charge the system. What size engine do you have?
I would first check to make sure everything is hooked up correctly. This actually happens a lot, I would double check everything and then if it still is not correct, most part stores will do it for free. You can also use a volt meter to see if there is any output.
Sean
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Monday, July 8th, 2013 AT 3:15 PM