IOD Fuse draining battery

Just purchasesd a 2001 Grand Caravan. The IOD fuse is pulling a full amp and draining the battery. When IOD fuse is removed, all is well w/ remainder of vehicle. Anyone know what's connected to the IOD fuse that could be pulling a full amp? Also, this happened right after I cleaned the vehicle...was fine before I cleaned it. Did I hit something or do something by mistake that is attached to the IOD fuse? Desperate for answers. Thanks!