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Bad diode pattern

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Old 03 Mar 2010, 06:27 pm
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Location: BlueRidge Texas
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Default Bad diode pattern

My daughters car would not start yesterday.Hooked charger up took it to Auto Zone and had it tested he says it is a bad diode pattern.Battery tested good as did alternator.Any ideas what this is?Thanks in advance
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Old 03 Mar 2010, 07:01 pm
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Join Date: Nov 2003
Location: Felton, Delaware
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Default Re: Bad diode pattern

Alternator puts out AC, battery needs DC - there are diodes that recticfy the AC and you have some bad - I don't know how they can say alternator is okay - the diodes are usually considered part of the alternator.
Bottom line - your battery isn't gettting charged, and I think you need a new alternator.
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Old 03 Mar 2010, 07:06 pm
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Location: BlueRidge Texas
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Default Re: Bad diode pattern

thank you very much.she has a extended warranty on the car and i just checked alternator replacement is covered.
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