Here's a system I'm trying to get going. The irrigation controller is located at the field being irrigated. The booster pump is far from the field being irrigated. There is an existing 2-conductor wire that runs from the controller to the booster pump to operate the pump. This wire runs several hundred feet under a paved parking lot so replacing the wire would be a bigger job than I want to do. When the timer calls for the pump to start, I get 27V at the pump start terminals of the controller. At the other end of these undersized wires, I get only 9 volts which isn't enough to close the relay to start the pump. Now, I could swap the relay for a 12V relay and probably get buy except that there is a second timer that also operates this pump from a different location and the second pump is close enough to provide the 24V the relay needs. So the 24V relay must stay. Here's two Rube Goldberg ideas I've come up with but I'd like something less home-made. Idea 1: Install a 50V power supply at the field controller and use a relay to let the controller send 50V from this power supply to the pump. This might get me over the threshold to make this thing operate. Idea 2: (Only nerds like me need read on) Install a "full bridge rectifier" at the field controller so I'm sending DC over the wires instead of AC. The pump start relay magnetic winding will provide a large amount of impedence to AC but less so to DC meaning the current in the relay coil should be higher with DC. Higher current means a stronger magnetic field and maybe the relay will close. Obviously I'm grasping at straws here. Any good ideas appreciated.