MY 87 5000 Q, will not turn off. I have the key in my hand and the engine is still running. I have replaced the Ignition switch (it was broken) but the problem still exists. has anyone had or known of this problem. The dash warning lights stay on but all accessorys (heater, radio, ect...) turn off. any ideas as to a fix would be appriciated.

only thing can think of is a broken/shorted wire from the ignition switch or sticking relay