I use this device for debugging, it's invaluable and cheap: https://www.jeffgeerling.com/blog/2017/review-satechi-usb-type-c-inline-power-meter-st-tcpm https:/

I use this device for debugging, it's invaluable and cheap: https://www.jeffgeerling.com/blog/2017/review-satechi-usb-type-c-inline-power-meter-st-tcpm https://www.jeffgeerling.com/blog/2017/review-satechi-usb-ty...