If your battery is fully charged, the car can start and run from the battery with no alternator at all. It might run 1/2 hr with no alternator.
A good test for the alternator is to start the car and then unhook one of the battery terminals. If the alternator is good, the car will keep on running without the battery. If the car turns off hen you disconnect a terminal, then the alternator isn't working.
But a bad alternator won't stop your car from starting...it will just not keep your battery charged or keep the motor running once the battery gets less than 12V
How
to inspect Vehicles Alternator?
http://repairhelpcenter.blogspot.com/2011/11/how-to-inspect-vehicles-alternator.html
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How
to Test Vehicles Alternator?
http://repairhelpcenter.blogspot.com/2011/11/how-to-test-vehicles-alternator.html
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How
to Service Vehicles Alternator?
http://repairhelpcenter.blogspot.com/2011/11/how-to-service-vehicles-alternator.html
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How
to Replace Alternator?
http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-alternator.html
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How
to monitor Vehicles charging system?
http://repairhelpcenter.blogspot.com/2011/11/how-to-monitor-vehicles-charging-system.html
-------------
Car
Alternator making noise?
http://repairhelpcenter.blogspot.com/2011/11/car-alternator-making-noise.html
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Car
Alternator Working Intermittently?
http://repairhelpcenter.blogspot.com/2011/12/car-alternator-working-intermittently.html
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Car
not starting or turning over indicates towards multiple possibilities. It can
be issue with battery or weak battery. But if battery checks out ok, then it
can be starter issue or faulty alternator or problem with low fuel pressure or
no spark at spark plugs due to dirty spark plugs or faulty ignition coil or
injectors getting cracked or dirty and needs to be cleaned.
To
confirm the problem, the basic troubleshooting is required.
From
start to end troubleshooting these problems I suggest you
to check the help link below and follow its procedure: -----
Mostly
all types of car no start problems are discussed here with solutions:---
CAR
NO START: ENGINE NOT TURNING OVER:
http://alltypesofpartsreplacing.blogspot.com/2012/11/car-no-start-engine-not-turning-over.html
---------
These will help.
Thanks.
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