Battery Reads 12.5 Volts But Won't Start

Battery Reads 12.5 Volts But Won't Start. Firstly, if the motor isn’t running and your vom is showing 14v, i’d be looking for another meter, it ‘should’ be about 12.7v if the motor isn’t running… put the vom leads on the lead posts, try to start it, if it’s not cranking the voltage should stay pretty much the same, move. I agree with the others, 14.5ish while the engine running is indicative of a healthy charging system, this is actually your alternator output voltage not the battery.

2007 Honda Civic won't start. from www.justanswer.com

Under a light load it should read 12.5 to 12.8 volts. Ground it to one of the shock tower bolts. I tried it with a new battery that reads 12.5 volts and it starts effortless.

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That’s the normal process of how an alternator works. You can use a multimeter to test the battery voltage and know whether the battery is fully charged.

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Discussion starter · #3 · apr 19, 2020. Jump it again get it running and test the voltage at the battery with the motor running at 3,000rpm.

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You have a shorted cell. I tried it with a new battery that reads 12.5 volts and it starts effortless.

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Higher current, which should then decrease as the battery takes the charge. However if you try to use that 1 molecules worth of electricity , it won't even cause a dull red glow in a globe.

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What have you tried so far? Hyundai 2012 santa fe wont start.

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If unsure of state of charge, have someone crank the engine with your meter still on the battery terminals. Jump it again get it running and test the voltage at the battery with the motor running at 3,000rpm.

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Smart charging systems today will vary voltage as the battery needs it. 60% of the time, the battery is the culprit.

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Op, it could also be a bad cable/connection or a bad starter. When a technician receives a repair request for a vehicle that won’t start, usually the first task is to test the battery’s state of charge.

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Another way to check your car battery is to use a hydrometer. Then i will get a drop to 12.5 for a while then it kicks back up to the 13.6 to 13.9.

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Also, it could mean that dropping this battery to 12 volts would be like dropping a 12 volt battery. This blog post contains five common reasons why a car’s battery won’t start after getting a new alternator.

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It is possible that there is a problem with the battery connections. If you have a meter handy, check the voltage.

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You need a volt meter the problem is some ware between the battery and the ignition switch.check battery grounds all if bat is grounded you should have 6.5 v d.c from b+ to anything on the engine or frame one at a time then test both for 13 v at the same time jump them together.this could be your problem 2 battery's with 1 bad ground.then start from the other end the ignition. If the battery doesn’t read at least 12.5 volts, this means your battery is bad.

If It Has 6 Good Cells.

In this case, the car won’t start, and the battery is reading an slightly low voltage of 12.31 v, which corresponds to a battery at about 50% charge. A battery can have a dead cell and read 12.5 volts. Ground it to one of the shock tower bolts.

You Have A Shorted Cell.

Cranked strong for about 5 seconds then nothing. That should help confirm or eliminate the battery as a source of the problem. It is possible that there is a problem with the battery connections.

In The 14'S After A Start Is The System Recharging The Battery.

Then i will get a drop to 12.5 for a while then it kicks back up to the 13.6 to 13.9. Also batteries getting old colects sulphate on plates ,this degrades the cold start performance. If you have a meter handy, check the voltage.

You Can Use A Multimeter To Test The Battery Voltage And Know Whether The Battery Is Fully Charged.

However, if your battery reads 12.6 volts, it still doesn’t mean it isn’t bad. Higher current, which should then decrease as the battery takes the charge. The battery charger ammeter should start at a.

A Fully Charged Battery Should Read 12.6 Volts With The Engine Off.

(black lead from the meter to the negative post, red lead to the positive) engine running and preferably with all peripherals off (lights. Jump it again get it running and test the voltage at the battery with the motor running at 3,000rpm. But battery is the most likely.