I apologize if this is too vague, I am pretty new to electronics so I’m not really sure what information is relevant. Anyways, I am using the relay shield with my Photon and have it powered with a 12V power supply which works fine. However I am trying to hook up a couple of shift registers running on 3v3 logic and so I tried using the 3v3 pin as a power output. I hooked up a GND pin on the photon to the ground pin on the registers as well. When I hook those up the photon doesn’t power on even though I see that the relay shield has power through the blue LED. I am wondering if maybe the photon is powered through that 3v3 pin when using the relay shield? I am confused as to why it won’t power on when I connect those pins, any help would be greatly appreciated.