A recent purchase, my 1989 Chevy p3o short bus is in tip top shape. Except for one problem. First of all, the runners, headlights/brights and brake lights work. The problem occurred when I was doing a light check and found that the turn signals were not signaling. Thinking that this was a routine fuse, connection, or bulb issue, I started with the fuse panel. AHA! I said...A burnt 15 turn signal/backup fuse, an easy fix. I replaced the fuse and started the engine. Immediately, the backup alarm came on despite the bus being in park and remained on in drive as well. In addition, the engine seemed to be throttling higher or possibly the starter is engaging unnecessarily after starting. When I removed the new fuse the engine ran normally and the backup alarm and turn signals did not work (obviously). Any thoughts? Crossed Wires?