by Kace » Thu May 10, 2012 11:45 am
I would be VERY surprised if your battery is at fault here - still feel it's the alternator. I hear you asking why..... ?
I replaced my alternator just before Christmas with a brand new shiny unit - mechanic told me when he installed that the output appeared less than he would have expected. Volt meter in the car read between 12-13v when newly installed. A proper OEM FTO alternator will run the meter up to nearly 14v.
5 months later my new alternator failed. My battery was also pretty poor as it was 4-5 years old so I decided to replace. I drove the car for 2-3 days without a fully working alternator that wasn't charging my battery. As a result my new battery voltage dropped to between 8-10v (while driving) and if I drove for a bit more I'm sure that it would have gone to zero within a couple more days.
Everything will drain your battery to zero while driving if it's not being charged, e.g. wipers, lights, radio, heater etc. etc. - it will die within days when using these things.
I have since replaced my alternator with an old OEM one from Dan - all sorted now with 14v on the meter.
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