So when I had all wired as depicted in the first image, it worked fine, no problems. The red LED on the L298N board was illuminated and the dc motor was following commands from my Raspberry Pi.
Now I tried to add an SPST on/off rocker switch to the circuit, and this is where my L298N stopped working. I connected the SPST switch as depicted. When the switch was set to off nothing happened, as I would expect. When I toggled the switch to on, the red led on my L298N flashed, and that was the last time it did. I can confirm that is not only the LED that ceased to function, due to the fact that the DC motor won't respond when I recreated the circumstances of when it was functioning.
Other variables/variations: I was using 4x AA batteries in both cases, however, I used a thicker wire to connect the SPST switch to the L298N than I did in the first situation/image, when it was working.
In the second case, I did not have the wire properly connected to the L298N, I just touched the screw of the L298N wire connection.
The Raspberry Pi was not connected to power in the second case, however, if i remember correctly, it was in the first.
How come my L298N stopped working? I am new to electronics and I would like to learn from this experience.