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The battery and or alternator maybe defective, even new parts can be defective, look into getting the alternator and battery checked, if they are good, than you have some other electrical problem, maybe parasitic draw.
Have your alternator checked, it may charge some but not enough to keep your battery charged. If it has an internal short (blown diode)it can discharge your battery.
have the alternator checked. if the alternator is not charging the vehicle is only supplied with what power is stored in the battery. once the battery is dead there is nothing to charge it
You can start by disconnecting the battery ground cable, connect a 12 volt test lamp between the cable and the battery post, If it lights up you have a short. and you'll need to start pulling fuses one at a time until the test lamp goes out. at that point you will know where to look for short.
This has happened to me TWICE in the past 4 months. I had Lexus road side service come out both times to check the car out. Each time the battery was totally dead. The road side mechanic said that if the car is not driven at least 15 minutes nonstop a day, the battery runs dead as there are so many draws from the car on the battery. If you do alot of stop and start driving like I do, that isn't enough to recharge the cell of the battery, it must be non stop driving time. Recommend that I get a 1.5 tricky charge device an hook to battery at least one night a week to keep the battery charged. This is really frustrating with such a new car. I've spoken to other owners of other model luxury cars and no one has had this problem.
this is a hard one, the battery goes dead from time to time,youll have to keep an out for lights staying on, a brake switch that stick sometimes,could be a radio shoting or a cd player drawing volts with key off,best way is to hook battery to a draw tester ,see if it drawing then start removing fuses one at a time to try and pinpoint the system thats drawing. if battery is charged and removed from car for a week will it go dead? ive had cars with bad batteries that had the same symptons.
It could very well be a defective battery, you could have 1 or more bad cells in the battery. A voltage regulator or an alternator. If it isn't one of those then there is something drawing power from somewhere that is causing it to go dead.
Quite often the alarm system ends up being the culprit. If you have, or know someone, who has a clamp on amp gauge that can test the draw from that circuit, it should tell you what you need to know. It could be that or a combination of various draws from your system.
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