Hey, it still seems like there is a power leak from the planter (at least from BC power). I started a new world, and it did the same thing. It looks like it 'overdraws' power when it plants, and once it's overdrawn, it starts draining power when it's not being used.
Edit: It looks like it's not just the planter that's doing it. The harvester is as well.
Edit2: Actually, it seems unrelated to the overdrawing. They both seem to leak BC power.