I have just finished refurbishing a 752A seaboard coal loader and the clam shell won't open. I am able to open it manually and it will stay open on it's descent but when the red button is pushed the clam closes and will not open again. Originally I had 2 wires soldered to the left side of the solenoid. I don't remember where that extra wire went. When I push the chute button the solenoid works fine. I have followed portline hobbies wiring schematic and it shows only 1 wire attached to each side of the solenoid. I am not sure what the problem with the clam shell is.