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You either have a faulty alternator or there is a constant power drain on the battery when the car is switched off as a result of a fault in the electrical system.
If i it is not charging fully as designed the only other source of power whilst you are running the car is the battery. Thus the battery will drain.
2. Slow power drain.
This will occur when the car is idle such as overnight. In this case, power is continually being delivered to a system on the car which is meant to be inactive due to a fault with the electrics. This can run the battery down so low the starter motor will not kick over when you try and start the car.
You need to get the car to a competent mechanic for tests so he can identify the cause and rectify it. For example if the old alternator is faulty and will not deliver sufficient charge to run the vehicle you will need to install a new one.
Technically the power has to be going somewhere. Either the battery has a dead cell, or you have a bad connection at the main cables, or you do in fact have a slight current draw. If you disconnect the battery cable, does it still go dead overnight ?
replace throttle body gasket. first check to see if carbon has built up around the throttle valves in throttle body if so remove and clean it with throttle body cleaner.and a old tooth brush. besure to remove all electrical components or any thing that plastic or rubber the cleaner will destroy it.