My 2 cents from August 8, 2009:
RV particulars: Monaco Diplomat SFT, Roadmaster Chassis
Driveline (Engine, Transmission) Cummins 8.9 400 HP, Allison 6 Speed World Trans
Miles: 9,000
Year: 2008
Break Down Description: Houston TX to Marietta GA. 2nd day, on I-285 West approx 1/2 mile prior to Exit 18, thought I hit something even though road was clear and traffic light. Immediately "ALTERNATOR FAILURE" light came on. Presumed the fan belt broke.
Symptoms: Alternator Failure light blinking, alarm sounding. Engine Overheat Light and alarm shortly thereafter, "LOW BATTERY" light and alarm.
Effect: Engine overheating.
Cause: The fan belt pulley bearings failed, causing/allowing the fan and pulley to tilt forward and down. The fan (plastic) hit the crankcase pulley and shattered all 8 blades almost to the base. Shards of the fan cut the fan belt. More shards were thrown through and into the radiator. Some of the fan pieces even penetrated the heat shield and there were deep dents/cuts into the floor base in the master bedroom area.
Outcome: Towed to Cummins Power South. This is a Motorhome specific Cummins Service Center. They were terrific, fixed everything in a timely fashion. Bill Thomas, Cummins Service Advisor, arranged the tow after offering three different tow companies. The repairs were covered under Cummins warranty. The tow covered under Good Sam ERS. Fan and radiator had to be ordered from Monaco (YIKES!!!). We were back on the road in 6 business days, most of the delay due to getting parts from Monaco.
Bud