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Voltage is running at 14.9 and battery burns out after 1 year use. Battery is dead, replace 1 year ago...

Customer Question
Voltage is running at 14.9...
Voltage is running at 14.9 and battery burns out after 1 year use
JA: Have you tested the battery? Is the battery fluid low?
Customer: Battery is dead, replace 1 year ago, mechanic said would not warranty because alt reading was 14.9
JA: What is the model/year of your Jaguar?
Customer: 2002 x type
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: I'm a 40 yr old female accountant... that being said, I've done all the work on my car so far and it's still running.. haha. I watch you tube and that has worked so far...
JA: Anything else you think the mechanic should know?
Customer: not at this moment.
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Jaguar Mechanic about your situation and then connect you two.
Submitted: 1 year ago.Category: Jaguar
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Answered in 5 minutes by:
6/19/2016
Jaguar Mechanic: Genchi Genbutsu, Technician replied 1 year ago
Genchi Genbutsu
Genchi Genbutsu, Technician
Category: Jaguar
Satisfied Customers: 4,396
Experience: Toyota Certified Master Diagnostic Technician, ASE Master Technician with L1 Advanced Engine
Verified

Thank you for allowing me to help you with this concern today and am sorry to hear that this is happening. I will have to ask you a few questions so that I can get a better understanding as to what may be going on with your X Type.

Did your mechanic test the alternator while he/she was there? Was the diode pattern abnormal?

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Customer reply replied 1 year ago
it was tested. My mechanic told me that it was the alternator because he replaced a warrantied battery 1 year ago (which the prior battery lasted almost 3 years) and that the voltage from the alternator was 14.9 and so he could not warranty the battery again until he did a full diagnostic to determine if it was a faulty battery or the altinator. I took it to autozone where they confirmed the battery was dead and that the alternator was giving 14.9 volts. They said that if I bought a new battery that it would not last because the alternator was giving off too high voltage
Customer reply replied 1 year ago
I don't believe the diode pattern was abnormal - as neither place said it was. Just high voltage
Jaguar Mechanic: Genchi Genbutsu, Technician replied 1 year ago

I see. The problem will not be the battery at all and will be the alternator. Just and FYI and you may already know this but car batteries have 6 cells hooked in series and each has 2.1 volts. Thats why a good battery has 12.6 volts (6 cells X 2.1 volts). Well a good charging system should put out around 13.6-13.9 volts (even 14.0 if the battery was dead from like using the radio when picking up a friend) but no more than that. At 14.9 volts the internal voltage regulator or the alternator is not regulating the voltage like it should.

Does this make sense?

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Customer reply replied 1 year ago
Thank you. That's what I wanted to confirm. Makes sense. Case closed!
Jaguar Mechanic: Genchi Genbutsu, Technician replied 1 year ago

My pleasure! If you have more questions, please ask as I strive to give Excellent service. Also please take the time to rate my help (1-5 stars), as it helps me as I have just helped you.

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Jaguar Mechanic: Genchi Genbutsu, Technician replied 1 year ago

Were you able to see my last reply?

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Genchi Genbutsu
Genchi Genbutsu
Genchi Genbutsu, Technician
Category: Jaguar
Satisfied Customers: 4,396
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Experience: Toyota Certified Master Diagnostic Technician, ASE Master Technician with L1 Advanced Engine

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