1997 Marathon with 20KW Powertech Gen Set.
Generator starts and runs fine. Voltage is 118-120 both legs.
After running a few hours the voltage drops off to less than 60 volts.
I only dicovered this problem on my last trip back from Las Vegas. Apparently, as the voltage drops off, the electrical system (inverters) take over so the only clue I got running down the road was my front cruise air unit shut down (it runs on generator or shore power only).
Any good ideas on this little challenge?
Jim