Alan, Chances are the smoke element is touching the chamber internally. It should NOT be. With 4 pin smoke plug removed from circuit board measure the ohms across the resistors. Should read about 8 ohms. Then test one side to a screw on the smoke unit. If 0 ohms you have a ground. Either stray wire soldered on a the PCB, or the internal resistor pushed against the chamber. Best to get that fixed.
If you can find a switch hole close to the charge port you can open it up to fit the charge port thru. Otherwise tape it so the back terminals can't touch any metal. The engine charges while running, so that would only be needed if the engine sat for several months. G