As you're looking at the planter from the rear, under the left side of the left hopper there should be a 2 pole weather pack connector that is powered to 12 volts. It's been there on both of our planters. It should be able to handle a scale head. I believe this power is keyed but I can't be positive on that. I have to run a couple of hot wires back there for other things so not sure where I'll get power yet.

I just unboxed all of our scale components tonight. Hope to have the planter inside and start working on it tomorrow afternoon.