Gererator wont put out any volts

check for fuel flow blockage
check for blocked main jet

Our motorhome Onan 5000 Marquis generator will turn over and try to start but fails everytime we test. We have primed, gas and oil are fine and we have new spark plugs. We also changed the gas filter on the generator. Any suggestion? Thanks, Loretta

It sounds very much like no AC output from the stator to the run circuit, or the main PCB failure

Sounds like low compression. Check the compression or have a small engine shop do a leakdown test on it for you

Actually the term is "flash" and it is a simple way of re-energizing the rotor with 12 volts. Look towards the bottom of page of the link and you will see how it's done.

http://www.generatorguide.net/howgeneratorworks.html

Try dinosaur electronics for a cheaper board,
http://www.dinosaurelectronics.com/Onan_boards.htm

Economy mode is not really meant for use when you are working, more like when you are idling and using only a very small load, it must be run in Normal mode when driving the Normal load. As the Engines Rev's are "Tied" to the "Draw" from the "Outlet". More draw, the higher the rev's need to be, but in economy mode,it is Governed, and cannot Rev up enough to supply full power.

1. Check for any blown fuse and replace. It can be traced directly from the output lines.
2. Check field excitation. The field excitation is supplied by the battery to the excitation coil through a pair of carbon brushes. If the brushes are worn out, no excitation field is supplied and no output is generated. Replace carbon brush if found worn-out.
3. Use an analog multitester to check the continuity of the carbon brush and the field coil.
   

Check the voltage with a meter in all the recepticles with your meter leads in the left and right slots on the plugs. Is that 184 volts AC there? If so, your gen has big problems with the voltage regulator. Let me know what you read. You can check the right slot of each plug to the round ground hole on the plug too, should be 120 volts there.


If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

turn the throtle knob to while checking voltage & hertz