Greetings everyone. Reaching out to anyone if they can give me some insight on how to provide constant power to the USB port on the GPO (retro) boombox. I want to attach a Sirius XM Stratus 7 receiver. The GPO has Line In already. And I'll just mount the magnetic antenna from the Stratus 7 receiver on top of the boombox. I bought a USB power cable made for the Stratus 7 receiver but the GPO USB port only has power when the dial selector is turned to USB. When the dial is set to AUX IN, the power is disconnected from the USB port thus not being able to power my Sirius receiver. I have zero knowledge and no schematics available for the GPO. I can send more photos.