The exterior tank only runs when I hit manual switch. I drained oil level 1 1/2 inch below low level line but tank does not kick on. I checked the wires coming from the motor. 1 is hot and the ground does not ground unless I hit switch. Seems like instead of sending power to fill, it will connect the ground to fill. But it will not ground with key in on position or while running motor only when I hold manual switch. Is there a relay or fuse that I can check to get the tank to fill..