ANSWERS: 7
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Its dead - get a new one (probably got a buckled plate inside)
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possibly starter/ alternator problems, but honestly check the multimeter for a misread first.
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Try the same battery on another similar car. If that too does not start buy a new battery. If the second car engine starts then check the wiring in your car.
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before you buy a new battery have the old one tested. it might be somthing else draining your battery, but it doesnt sound like it.
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Put in a new battery then start the car and ck batt with engine running accessories off, should be 14-14.5 volts at batt, charging voltage, if it is you fixed it, if it is at 12 volts engine running, you are not charging.
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A battery will sometimes show correct voltage (14 volts +/-)with no load. If it drops below 12 volts when applying a load (such as starting) it may still be a bad battery. I currently have a "spare" battery that shows 14 volts when taken off the charger, but drops to less than 8 when installed in a "start" application.
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The most common problem with battery failure today is partition breaks. The lead coupling one cell to another is "spot welded" through the plastic partition. The weld can break and of course there will be acid on the break making it conduct. The result, you can have a brand new battery with a partition break that will read 14v. but has almost no current available.
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