Check for any electrical components draining the battery when the car is off. Disconnect the negative battery terminal and use an ammeter to measure the current draw.
2. Faulty Charging System
Assess the health of the alternator and charging system, including wiring and voltage regulators. Faults can hinder proper charging.
3. Aging Battery
If the battery is old or has reached the end of its lifespan, it may lose capacity and struggle to hold a charge.
4. Faulty Door Switches
Inaccurate position reporting can prevent systems from entering low-power modes.
5. Damaged Wiring or Connections
Check for frayed, broken, or loose wires connecting the battery and electrical components.
6. Issues in Modules and Sensors
Faulty modules or sensors can draw excessive power due to malfunctioning.
7. Poorly Functioning Ignition Switch
The switch may not fully turn off components when the key is removed.
8. Malfunctioning Alarm or Security System
A system issue could trigger excessive power draw.
