I have a 2001 Oldsmobile Silhouette. Everything worked fine until I changed a fuse. I changed it because the coolant fan was'nt working and the van was overheating..Now engine won't turn over. I put in a new battery and it still won't turn over..Nothing..When I turn on ignition,the message light goes from Red Battery Icon,to Security,to Service Trac System. Can Anyone help?