I am afraid I have to once again add to this thread. Nothing would make me happier than to stop posting here.
RV particulars: Itasca Suncruiser 33V
Driveline: 8.1 W-20
Miles: 3978
Year: 2004
Break Down Description: Engine lost power topping a 7% grade, all the lights on the instrument cluster came on and all the alarms sounded. Went into reduced power mode and limped off to a stop on the right shoulder on US 66 between Kingman and Peach Springs AZ Sept 22, 2004
Symptoms: All dash warnings came on and power went away.
Effect: Had to pull over in an area with no cell service and stop.
Cause: Unsecured secondary grounding strap from the factory
Outcome: Turned off the engine and did a visual inspection of the engine. Everything looked fine including temperature. Started it back up, ran fine except orange " check engine " light stayed on. Kept driving another 16 miles watching gauges until I got cell service. Called my dealer "Range RV Victorville, CA" they were no help. Told me to have it towed to the nearest Workhorse service center 186 miles away in Flagstaff. Called the 800 number on my Workhorse card, they connected me with a technician. He had me crawl under the right front wheel and pull off the air cleaner cover and check for major dirt or blockage and mass air flow sensor connector wiggled loose. That wasnt it so he had me turn off the ignition for 2 minutes, then turn the key from dead off to start and back 5 times in 10 seconds. That reset the orange trouble light. He advised me to have fun on my trip and have my dealer download the trouble code history when I got home. No further problems that trip. which was 1400 miles.
I got back home and turned the rig in for service. They found a ground strap which was not bolted to anything. There were 21 trouble codes saved in the PCM which made no sense, so they dug deep and found the hanging grounding strap.
Waiting now to pick it up from service. 29th day in the shop in the first 9 weeks of ownership.
God Bless workmanship.
Workhorse says Winnebago must have disconnected the grounding strap during the coach build and forgot to reconnect it before roll-out.