Good day. There may be a secret 12 V outlet more easily accessible from passenger side, in some models.
Likely not what you are seeking but there are also USB ports that offer 20V however you may need to get an adaptor from USB to 12v if radar uses 12v socket normally and even then it may depend on the power requirements of the device
Likely not what you are seeking but there are also USB ports that offer 20V however you may need to get an adaptor from USB to 12v if radar uses 12v socket normally and even then it may depend on the power requirements of the device