Check out this website. i work at a salvage yard and have seen vans brought in that have burnt even while turned off and parked...The recall is issued by Ford and would be worth your while to check and see if your Ford falls under the recall...just some FYI...
Ford Windstar Recall For ABS Brake Light Issue Recall Results : ODI - Office of Defects Investigation
There is no such thing as a stupid question, just stupid answers!