The CAN-Bus shield is receiving power from the OBD2 port via the DB9 connection so if I connect the Arduino to my laptop via the USB port to view the Serial Monitor, will that result in a power overload and fry the CAN-Bus shield and/or the Arduino?
I must add that I am referring to the CAN-BUS Shield Hookup Guide where I have soldered header pins into the shield and then connected the shield into my Arduino MEGA 2560. I’m not yet using the LCD to monitor the serial output but was intending to Serial Monitor function in the IDE by connecting the Arduino up to the USB port on my laptop while also connecting the CAN-Bus shile up to the OBD2 port via the DB9 interface hence, the two power sources being connected simultaneously to the CAN-Bus Shield/Arduino MEGA combo.
The CAN-Bus shield is receiving power from the OBD2 port via the DB9 connection so if I connect the Arduino to my laptop via the USB port to view the Serial Monitor, will that result in a power overload and fry the CAN-Bus shield and/or the Arduino?
No, you will be fine. The shield passes 12 volt power down to the Arduino and the Arduino selects the best power source available to it between the shield or USB.