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How do I find out whats draining my car battery?
How To Diagnose the Battery Drain.
Step 1: Remove Negative Battery Cable. Negative Cable Removed. ... .
Step 2: Check the Draw Across the Negative Cable and Battery Post. ... .
Step 3: Remove and Replace Fuses. ... .
Step 4: Isolate and Fix the Issue. ... .
Step 5: Replace Negative Battery Cable..
How do you stop a car battery from draining when not in use?
If so, here are some things you can do to save your car battery when it's not in use..
1) Use a trickle charger or battery conditioner. ... .
2) Avoid turning your car on and then off again. ... .
3) Avoid short journeys. ... .
4) Drive your car for 15-20 minutes at a time. ... .
5) Alternate trips if your household has more than one vehicle..
What would drain a car battery overnight?
This happens when something – a glovebox light, an amplifier, any electrical component – is pulling power from the battery when it shouldn't. Since the alternator isn't generating vehicle electricity, the problem component pulls from the battery, slowly draining it overnight until your vehicle won't start.
Can an alternator drain a battery when the car is off?
A corroded or defective alternator diode will faultily continue charging the circuit even when the car off. This, in turn, will drain your car battery and cause the car not to start.