How Long To Charge Alternator. Generally speaking when the engine runs on an RPM of about 2000 the battery is bound to charge well regardless of the batterys extent of power depletion or its capacity as long as it does not have any defects or is in any. Charging a car battery fully with a 12 volt charger will take around 12 to 24 hours depending on the situation.
If you have an outboard engine produced since 2000 your engine has an alternator designed for charging the electrical system and batteries. How long does it take an alternator to charge a flat battery. Once you connect the alternator to a terminal it should show between 12 to 135 voltage scale.
Since the battery sometimes gets hot during recharging so you need to stop charging it for some time until it gets to a normal temperature to start charging again.
Once started the alternator runs the whole show. Any number less than that indicates its not capable to charge the level of battery completely. If you have an outboard engine produced since 2000 your engine has an alternator designed for charging the electrical system and batteries. For the health of your battery and car replace the alternator as soon as possible once it has failed.
