The "Charging Sytem" includes the battery, the alternator, the voltage regulator and all related connecting wires and cables. If the charging system was tested and it tested "good" then all of these components are working properly.
If your charging system is good and you continue to have a dead battery, then you probably have an "Ignition-Off draw". This means that something is staying on after the ignition is shut off. This could be interior lamps not shutting off due to a bad door switch, or the headlamps being left on, or some other electrical component in the vehicle that is malfunctioning. If this is the case, then you need to have your vehicle checked by a competent Service Technician who, using the proper equipment and techniques, can locate and repair the source of the problem.
How did you test battery and charging system?
Your charging system is computer controlled. Check for applicable trouble codes. To check codes yourself, at the least you need an obd2 code reader that will check manufacturer specific codes as well as po codes.
Take wire connector loose from generator . The two wires on the left should show battery voltage, do they? What is the voltage spec? This is with key off and no charger hooked up.
The two wires on the right are to and from the computer, To check those, at least, you need a digital multimeter that has a duty cycle or frequency setting, with engine running, should activity on both wires. You have a battery temp sensor that could cause problems.
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