12-09-2015, 01:22 AM
Didn't think it would work without it. Is your eheim always powered or only when feeding? I probably have the pin set so the ground is connected that's why it works for you. You can leave it as is, if you want it like mine you would need to move the GND wire in your USB connector and then run the jumper in the picture. You don't need to solder it, you can use one of the dupont style jumpers like connecting the relays.