here is a good one
symptom : motor just quit
effect : nothing would work no starter .no gauges nothin .but it would start on the coach batteries and run as long as i held the switch down .made it to a exit ramp.
cause : the battery disconnect blade switch broke off and disconnected. hooked all the cables direct to the battery and shazam it worked .
outcome : put a new switch on it hopes this works . it is scarry to be far from home and something happen . mine was a quick fix. i can't amagine what is is like to have something majior happen .