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Alternator
06-19-2007, 09:02 AM
Post: #1
Alternator
The battery in my car went dead and a man at O'Reilly Auto parts replaced it.  When he first installed it, he reversed the terminals causing the battery to spark, snap and smoke.  He said, "Oops! Doesnt go like THAT, does it?" He then, unhooked the battery and installed it correctly.  A few days later, the car would not start again.  I took it to a mechanic and he determined that the alternator needed to be replaced.  O'Reilly's denied that he installed the battery incorrectly and advised me that my old battery held a charge and claimed it was a faulty alternator from the beginning. I put my old battery back in the car and, after a few days and although I had a new alternator, the battery went dead again.  Was it the alternator or the battery all along?  What happens to an alternator when the polarity is reversed?
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06-19-2007, 01:32 PM
Post: #2
RE: Alternator
What year and model is it? Did O'Reilly test the battery and alt. the first time before replacing the battery?

Cary Joe York
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06-19-2007, 02:11 PM
Post: #3
RE: Alternator
Hello! It is a 2001 BMW 325i with only 37,000 miles on it. No, O'Reilly's didnt test either the battery or the alt. before replacing the battery.

CaryJoeYork Wrote:What year and model is it? Did O'Reilly test the battery and alt. the first time before replacing the battery?
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06-20-2007, 03:55 PM
Post: #4
RE: Alternator
I have seen altenators damaged by reversing the polarity. However, must systems have a fuse to protect the alt. It sounds like to me that O'Reillys damaged the alt.

Cary Joe York
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06-20-2007, 03:57 PM
Post: #5
RE: Alternator
After looking at a diagram, there is no fuse in the main battery feed to the alt. Therefore more likely to damage the alt. if you reverse polarity.

Cary Joe York
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06-20-2007, 04:18 PM
Post: #6
RE: Alternator
Thank you so much for your time and for the consultation!!! I appreciate your review of the matter!!!!!
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01-29-2011, 02:54 AM
Post: #7
RE: Alternator
As the alternator is running, it produces current that passes through the diodes to the battery connection on the alternator. The current then travels to the battery through the positive battery cable. As long as there is a good connection to the battery, the battery will be maintained in a fully charged condition and the electrical system will function properly.
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