Quote Originally Posted by Zulfe View Post
Just received my heat bed relay. I connected one wire of the bed to J2 and ground from my PSU to J2. I connected the other wire to the OUT terminal on J1 and 12v to the IN on J1. My bed still isn't heating. I have changed any firmware yet. According to what I downloaded from the build guide (which I assume is what my printer is running), my motherboard type is 33. I assume this is so because I found '#define MOTHERBOARD 33' in the configuration.h file included in the download in the i3v 8" build guide. Is there something I'm missing, maybe a specific pin redefinition for the heat bed?

I need it to go to D09 instead of staying on D10.
Message received. Please stand by. With now two people struggling with heat bed relay wiring, I'll put together some wiring diagrams and try to explain things more than the build guide does. As soon as I finish packing for a couple weeks of international travel, I'll get on it. If anyone else wants to jump in, go ahead.