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Weak battery not holding a full charge or alternator not supplying a suffient charge to the battery - check with a voltmeter A fully charged battery should read approx. 12.8 without engine running Approx. 13.8-14.2 with engine running
No , just when the engine is running
You can feel it, hear it, open the hood and look at it and if it is running the indicator lights on the dash will be off.
Your car will have to at least have the battery running to charge the phone, but the engine does not have to be engaged.
what causes aknocking sound on mazda T35 engine when its running
The alternator - it provides a charge to the battery while the engine is running.
No , for the battery to be charged the engine must be running . This means that your alternator , if it's functioning properly , is charging the car's battery as the engine is on/running .
A fully charged car battery will read 12.6 volts, 75% charge will read 12.4 volts, 50% charge will read 12.2 volts, and a 25% charged battery will read 12.0 volts with the engine not running. With the engine running it will read 13.5 to 15.5 volts.
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The lack of oil?!?
Your question is sort of backwards, perhaps you meant what causes engine failure? Engine failure causes...the engine to fail. If someone told me their engine failed I would take it to mean that it stopped running, or wouldn't start.
radiator fans running to cool engine...