Something is draining my battery
Put a new battery in but it won't start the next day after it sits. Not sure what is draining my battery
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Have you checked that the boot light is not permanently turned on when the boot lid is shut? Place a mobile phone in "video taking mode" in the boot to check. Safer than someone climbing in to see ;-)
If the light is functioning correctly, disconnect the -ve battery cable from the battery and connect a DMM (digital multimeter) between the -ve battery cable and the -ve battery terminal. Set up the meter to measure DC Amps.
The average quiescent current should measure approx 50-80mA.
If you measure more than this amount of current then you need to remove each fuse, one at a time, from the engine compartment fuse box and also the passenger compartment fuse boxes until the current level drops to the normal quiescent value.
Replace each fuse, before removing the next one so as to not confuse which fuse goes where as they are not all rated the same.
When you find the fuse that is supplying the circuit that is causing excessive current to be drawn from the battery, check the fuse allocation chart (usually in the lid of the fuse box or the owner manual) to see what circuit it is used for.
Once you know that you're halfway there to finding out what's wrong.
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start by disconnecting the battery + terminal and putting an ammeter in the circuit. That will give you an idea how much current is being drawn.
That may help narrow down the culprit.
Typically, it will be interior lights or a device, like a GPS, connected to an outlet that is always powered. Maybe a dashcam.
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