Much has been said on various threads about problems with the spark plug wires on 7.3L engines... I just want to bring this to the front again because neither Tiffin nor Ford let me know; If I had known, I certainly would have changed plug wires as a preventive measure before breaking down and having to leave my motorhome abandoned in a fire evacuation zone.
NOTE: If you have a 2021
Tiffin motorhome, it may be built on a 2020
Ford chassis and this Technical Service Bulletin may apply to you!
See the attachment...