Hoo.commy 01 yukon will not start after sitting for 12 hrs. i have replaced the battery and alternator and the proble is still there.

https://shoptoolreviews.com/automotive/diagnostic-testing/parasitic-battery-drain/34587/

Do you see a brake light on while driving? That could be a bad alternator.

Ask your garage to perform a parasitic draw test - you could do this with a multimeter, as well; it sounds like something is draining your battery while off - it could be any fuse and not obvious like with lights on/etc.

I would 95% positively guess this is the issue due to time frame. If the garage doesn't know what this is, take her somewhere that does. Shouldn't be costly, either.

check the power in your battery and the output of your alternator. should read 14.3 and battery 12 volts check the battery both before and after you try to start it.

it's mean that the battery current to radio when to 0volt.
find out battery or alternator problems like battery voltage. a load test . or alternator is charging
hope it helps

Replace diodes on alternator .

Go through few Alternator related solved Solutions including replacement of alternator.Select and Click the link below:----How to replace alternator? http://schematicsdiagram.blogspot.com/2011/12/how-to-replace-alternator-on-gmc-sonoma.html
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How to test alternator on Dodge Stratus?

http://technoanswers.blogspot.in/2012/02/how-to-test-alternator-on-dodge-stratus.html

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How to test and replace Alternator on Audi A4 Car models?

http://repairhelpcenter.blogspot.com/2011/11/how-to-test-and-replace-alternator-on.html

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How to Remove Voltage Regulator on Car?

http://vwrepairhelp.blogspot.com/2011/11/how-to-remove-voltage-regulator-on-car.html

HOW TO REPLACE AN ALTERNATOR BELT

http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-alternator-belt.html

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How to monitor Vehicles charging system? http://repairhelpcenter.blogspot.com/2011/11/how-to-monitor-vehicles-charging-system.html

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Car Alternator making noise? http://repairhelpcenter.blogspot.com/2011/11/car-alternator-making-noise.html

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After replacing Alternator, the battery indicator light Comes ON dash?

http://howtobyme.blogspot.com/2011/11/after-replacing-alternatorthe-battery.html

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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

How to Replace Alternator? http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-alternator.html

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Alternator testing? http://schematicsdiagram.blogspot.com/2011/12/alternator-testing.html--------- Cars electrical system is pulsating? http://technoanswers.blogspot.in/2012/01/cars-electrical-system-is-pulsating.html------ 1998 Ford F150 pickup Battery Drains overnight due to Alternator? Alternator drains car battery? http://technoanswers.blogspot.in/2012/02/1998-ford-f150-pickup-battery-drains.html------- 2002 Ford Focus sits over night and battery goes dead? http://technoanswers.blogspot.in/2012/02/2002-ford-focus-sits-over-night-and.html--------- Charging system problem on Chrysler LHS car? http://technoanswers.blogspot.in/2012/02/charging-system-problem-on-chrysler-lhs.html---------- How to replace alternator 1997 Dodge Stratus? http://technoanswers.blogspot.in/2012/02/how-to-replace-alternator-1997-dodge.html------- How to replace Alternator on Mitsubishi Lancer http://www.howtorepairguide.com/2012/10/how-to-replace-alternator-on-mitsubishi.html
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These details will help.
For more help.Keep updated.
Thanks.
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Check your battery voltage it should be 12 volts then start it and check the voltage coming out of the alternator it should be 13-14.9 volts.If the voltage coming out of the alternator is less than 13 volts replace the alternator.If the alternators voltage is within 13-14.9 then its time to replace the battery.

if the starter cranks but the engine does not turn on, then you have a problem with the V.A.T.S. system (V.A.T.S. = Vehicle Anti Theft System) if starter is not working then re-check battery first, then take alternator to local parts store, they have alternator bench testers, if alternator is o.k. your starter is faulty. alternators should produce bout 12.75 volts to 14.5 volts, amperage varies on alt. types

It sounds like the battery has a dead cell in it. Replace the battery. If you have an alarm installed remove the in line fuse from the alarm and see if that stops the battery drain.

you need to get a adapter from any auto store that can handl e load you want