My Daughters car requires a jump start intermitently

2004 PONTIAC GRAND PRIX
120,000 MILES
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JHKULP
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There are some days the car starts right up no problem. Other days she goes to start it and she needs to ge6t a jump start and the indicator reads "Charging system failure".

I pulled the battery and had it tested at Advance Auto and it tested good.

I pulled the alternator and had it tested at Advance and it failed. They did not have the alternator in stock, so I went to Auto Zone. They tested the alternator and it passed (4 times). They told me the alternator was not the problem. I went to O'Rielly Auto Parts to see if it would pass or fail there. It passed 5 times.

Is there something I am overlooking?
Dec 12, 2011 at 7:08 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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