trying to hook up a toggle switch to turn the engine on and off, been trying everything but as far as I can get is hooking up 1 wire to the black wire I disconnected from the red on-off switch on engine and then the engine will start but I cant' get it to turn off unless I touch the other wire from the toggle switch to metal, but if I keep that wire grounded to metal all the time then the motor won't start, any suggestions?