went to start my 98 trooper today. When it started I herd an unusual noise coming from the engine. I turned off the ignition and the starter motor was still turnning over the engine. I quickley popped the hood and pulled the negative off the battery. so the the starter is somehow stuck in its starting mode. what could be stuck to allow the starter to still run even if the ignition key is in the off position? you would think that if you turned off the ignition that would cut power to the starter. would the problem be in the key switch? any ideas would be welcome