Maybe the connections to the speakers came loose when you pulled out the radio to replace the fuse. The workers are paid piecemeal and sometimes when the workers assemble things they don't take the time to properly connect things. Some owners have reported wires and cables falling from connections just traveling down the road.
Richard & Jill
2014 Flagstaff 832IKBS Classic Super Lite
2018 Silverado 1500 Crew Cab Z71 4WD All Star Edition
Camping since 1989, seasonal since 2000
Car Shredder Op/Tech, Scrap Metal Recycling - retired
The Faster I Go, The Behinder I Get.