The Tekonsha P3 has an electric over hydraulic setting. I haven't been able to verify it, but, I think when on the electric over hydraulic setting the compatible controllers will only send current to the hydraulic pump while the truck is moving. With the Ford controller set to "electric brakes" my understanding is that current is sent to the brake actuator whenever the brake pedal is pushed hard enough to generate over 3 volts. So, because the "electric over hydraulic" setting on the Ford IBC isn't compatible with my trailer's hydraulic brakes I have to use the "electric" setting. On the electric setting, if I'm sitting at a long red light (or waiting for a train) my hydraulic pump could be running continuous as I wait. To avoid this I could use "park" when stopped or possibly use minimal pressure on the brake pedal.