Not vampire drain issue. But battery use issue as a 300-350mw dashcam shouldn't be a problem but it is with the Model 3. Never has been a problem with my Model S. I installed an always on dashcam (Blackvue 750S) in the Model 3 directly connecting to the battery and it caused a problem due to the battery monitoring system on the Model 3. Tesla needs to somehow allow always-on dashcam install to protect in parking mode. The main battery charges the 12V battery, correct? Why should a dashcam cause such an issue?
This is what service wrote:
Concern: Customer states car needs service/contact Tesla service alert is on.
Corrections: 12V Battery and Fuses General Diagnosis
Inspected 12 volt battery assembly, found aftermarket camera's installed and connected
directly to the battery. Due to the consumption monitoring capabilities of the model 3 this
installation directly at the battery will lead to alerts and or loss of 12v. Replaced 12 volt
battery as one time good will. Disconnected aftermarket power wires from 12v battery.
Concern: Remote diagnostics show that this vehicle's 12V battery is in need of an urgent
replacement due to frequent overcharging.
Corrections: Battery - Auxiliary - 12V