Generator starting problem

Discussion in 'RV Tips & Tricks' started by alale11, Apr 10, 2017.

  1. alale11

    alale11 Junior Member

    I have a 2.8 Onan microlite RV generator when its cool it will start, and run until I shut it off, once I shut it off, it will re-start if done within a few minutes, but wait 15 or more minutes, and it will not start for at least a couple of hours. I have replaced the ignition coil, and the spark plug, since I do not get a constant spark when it fails to start, but, just one spark when the start button is released. I have checked the magneto voltage at the time that I am not getting a constant spark, and it reads 31 volts which is within normal range when cranking. At this time I have run out of ideas, maybe someone out there has had a similar problem and can help me.
  2. Nicole Rushing

    Nicole Rushing New Member

    There are about 4 possibilities. Bad circuit board, bad voltage regulator, dirty slip rings, or low oil pressure/or bad oil pressure sending unit. Probably the most common no-start problems are fuel supply, so change the inline fuel filter and make sure fuel flows freely. Cracked fuel lines are a common problem too, allowing the genny to suck air along with fuel.
  3. alale11

    alale11 Junior Member

    Well it seems that non of those 4 possibilities is the culprit, since I have already replaced those parts with the exception of the voltage regulator, which I have no problem the voltage and frequency is constant no matter what the load. Parts replaced: control board, ignition coil, spark plug, fuel filter, and air filter. and the problem has not changed one bit. So I think is time to bring in the experts.
  4. alale11

    alale11 Junior Member

    Just to update everyone that read the original post. The problem was the magneto, even though I was told that if I was getting between 15 and 50 volt A/C the magneto was good, well if was not. Replaced it, and it runs and starts, just like when it was brand new.
    Live and learn.

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